1. TOOLS

Lantern

操作界面

每个月开放免费的高速流量有500M

足够平常的代码更新下载，Facebook、Twitter、Instagram的使用，如果大量访问YouTube 估计就得升级专业版了

下载地址

https://github.com/getlantern/download

结合自己的系统下载对应的版本进行安装即可

设置管理

取消勾选开机自动启动

有的时候免费线路信号不好，连接不上，会影响原本网络的正常使用，所以在需要用到的时候再开启蓝灯，点击连接。

终端nano实现Mac支持ntfs磁盘读写

无需安装第三方软件（如：Paragon NTFS、Mounty）实现Mac支持ntfs磁盘读写

之前已经实现了cc盘的可读写挂载，现在进行另外三个盘的修改

先获取三个磁盘的UUID

关于本机

选取 系统报告

记下磁盘对应的UUID

在nano中添加设置

在终端输入sudo nano /etc/fstab 进入编辑界面

现在你看到了一个编辑界面

分别输入三个磁盘的设置

  • UUID=硬盘对应的UUID号码 none ntfs rw,auto,nobrowse
  • 换行回车

Ctrl+X保存

确认保存操作 敲击Y

回车 退出当前编辑窗口

设置成功 查看磁盘读写效果

推出磁盘

重新插入，发现Finder中没有显示这几个盘

Finder左上角工具栏中选择 前往 -> 前往文件夹

输入/Volumes/

出现所有的磁盘信息

将磁盘拉到左边边栏列表中 设置磁盘快捷访问

查看效果 已经可以进行写操作了

Git序

配置设置

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git config --list #查看git配置信息
git config user.name  #查看git用户名
git config user.email  #查看邮箱配置
git config --global user.name "username"  #全局配置用户名
git config --global user.email "email"  #全局配置邮箱

清空git缓存

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git rm -r --cached . #不删除本地文件  （git rm -r --f . 删除本地文件）
git add .
git commit -m 'update .gitignore'

删除在git add中添加的文件

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git reset HEAD file  
git rm –cached file  #删除暂存区的文件，工作区的不受影响
git rm --f file   #删除暂存区与工作区的文件

更新忽略规则.gitignore

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# .gitignore只能忽略那些原来没有被track的文件（Untracked Files）
# 更新规则生效步骤先把本地缓存删除（改变成未track状态），然后再提交：
git rm -r --cached .
git add .
git commit -m 'update .gitignore'

refusing to merge unrelated histories

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# 拉取合并两个没有共同祖先的分支
git pull origin master --allow-unrelated-histories

# 先fetch之后再合并
git fetch origin master
git merge origin/master --allow-unrelated-histories

放弃本地修改，强制拉取fetch更新

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git fetch –all  #下载远程的库的内容不做合并
git reset –hard origin/master  #把HEAD指向master最新版本

取回更新并合并

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git pull #和git fetch的区别：git pull = git fetch + git merge

git pull --rebase # 相当于 git fetch + git rebase

# 设置rebase为pull时候默认执行的动作
git config --global pull.rebase true

改变分支依赖

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#将当前分支基于依赖分支
git rebase 依赖分支 #对所有涉及的commit（"pick"）执行默认操作，将历史记录回滚到最后一个公共父节点，并重新生成两个分支的commit。

failed to push some refs to git

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# 远程库中部分文件件不在本地库中造成冲突
git pull --rebase origin master
或
git push -u origin master -f

Untracked working tree file ‘xxx’ would be overwritten by merge

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# 需要执行下面的命令才能修复：
git reset --hard HEAD    
git clean -f -d    
git pull

解决冲突文件

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# 远程库文件覆盖本地文件
git pull
git checkout file

# 暂存本地修改后拉取最新文件
git stash
git pull
git stash list  #查看暂存记录列表
git stash apply stash@{0}
# 冲突文件修改
git commit 
git push

# 本地提交冲突文件commit后拉取最新文件
git add file
git commit
git pull
# 冲突文件修改
git commit
git push

# 使用rebase情况下，完成冲突解决
git rebase --continue

git rebase --skip #忽略此次提交

修改commit注释

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# 查看提交的信息
git show

# 修改最近一次的提交
git commit --amend #--amend会将更改添加到最近一个提交中

# 修改最近n次提交历史(合并多次提交或拆分提交)
git rebase -i HEAD~n  # -i表示用交互式打开

撤销commit

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git reset --soft HEAD^  #不删除工作空间改动代码，撤销commit，不撤销git add . 
git reset --soft HEAD~1 #同上
git reset --soft HEAD~2 #撤销近两次commit
git reset --mixed HEAD^ #同git reset HEAD^ 效果是一样的
git reset --hard HEAD^  #删除工作空间改动代码，撤销commit，撤销git add .

还原到某一版本

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git tag backup_commit  #备份当前的分支到backup_commit
git push origin backup_commit
git reset --hard commit_id
git push origin branch -f

删除commit

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git reset --hard commit_id
git push origin HEAD --force

恢复已删除commit

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git reflog  #查看带hash值的历史操作，记录了某分支的每次操作
git reset --hard hash

查询文件中每一行代码的 commit ID、提交者和提交日期

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git blame filename

从其它分支抓取指定commit合入当前分支中

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git cherry-pick -x commit_id

Git Manual（已更新） 

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## Git Manual                                                                                

### NAME
       git - the stupid content tracker

### SYNOPSIS
       git [--version] [--help] [-C <path>] [-c <name>=<value>]
           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
           [-p|--paginate|-P|--no-pager] [--no-replace-objects] [--bare]
           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
           [--super-prefix=<path>]
           <command> [<args>]

### DESCRIPTION
       Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

       See gittutorial(7) to get started, then see giteveryday(7) for a useful minimum set of commands. The Git User's Manual[1] has a more in-depth introduction.

       After you mastered the basic concepts, you can come back to this page to learn what commands Git offers. You can learn more about individual Git commands with "git help
       command". gitcli(7) manual page gives you an overview of the command-line command syntax.

       A formatted and hyperlinked copy of the latest Git documentation can be viewed at https://git.github.io/htmldocs/git.html.

### OPTIONS
       --version
           Prints the Git suite version that the git program came from.

       --help
           Prints the synopsis and a list of the most commonly used commands. If the option --all or -a is given then all available commands are printed. If a Git command is named
           this option will bring up the manual page for that command.

           Other options are available to control how the manual page is displayed. See git-help(1) for more information, because git --help ...  is converted internally into git help
           ....

       -C <path>
           Run as if git was started in <path> instead of the current working directory. When multiple -C options are given, each subsequent non-absolute -C <path> is interpreted
           relative to the preceding -C <path>.

           This option affects options that expect path name like --git-dir and --work-tree in that their interpretations of the path names would be made relative to the working
           directory caused by the -C option. For example the following invocations are equivalent:

               git --git-dir=a.git --work-tree=b -C c status
               git --git-dir=c/a.git --work-tree=c/b status

       -c <name>=<value>
           Pass a configuration parameter to the command. The value given will override values from configuration files. The <name> is expected in the same format as listed by git
           config (subkeys separated by dots).

           Note that omitting the = in git -c foo.bar ...  is allowed and sets foo.bar to the boolean true value (just like [foo]bar would in a config file). Including the equals but
           with an empty value (like git -c foo.bar= ...) sets foo.bar to the empty string which git config --type=bool will convert to false.

       --exec-path[=<path>]
           Path to wherever your core Git programs are installed. This can also be controlled by setting the GIT_EXEC_PATH environment variable. If no path is given, git will print
           the current setting and then exit.

       --html-path
           Print the path, without trailing slash, where Git's HTML documentation is installed and exit.

       --man-path
           Print the manpath (see man(1)) for the man pages for this version of Git and exit.

       --info-path
           Print the path where the Info files documenting this version of Git are installed and exit.

       -p, --paginate
           Pipe all output into less (or if set, $PAGER) if standard output is a terminal. This overrides the pager.<cmd> configuration options (see the "Configuration Mechanism"
           section below).

       -P, --no-pager
           Do not pipe Git output into a pager.

       --git-dir=<path>
           Set the path to the repository. This can also be controlled by setting the GIT_DIR environment variable. It can be an absolute path or relative path to current working
           directory.

       --work-tree=<path>
           Set the path to the working tree. It can be an absolute path or a path relative to the current working directory. This can also be controlled by setting the GIT_WORK_TREE
           environment variable and the core.worktree configuration variable (see core.worktree in git-config(1) for a more detailed discussion).

       --namespace=<path>
           Set the Git namespace. See gitnamespaces(7) for more details. Equivalent to setting the GIT_NAMESPACE environment variable.

       --super-prefix=<path>
           Currently for internal use only. Set a prefix which gives a path from above a repository down to its root. One use is to give submodules context about the superproject that
           invoked it.

       --bare
           Treat the repository as a bare repository. If GIT_DIR environment is not set, it is set to the current working directory.

       --no-replace-objects
           Do not use replacement refs to replace Git objects. See git-replace(1) for more information.

       --literal-pathspecs
           Treat pathspecs literally (i.e. no globbing, no pathspec magic). This is equivalent to setting the GIT_LITERAL_PATHSPECS environment variable to 1.

       --glob-pathspecs
           Add "glob" magic to all pathspec. This is equivalent to setting the GIT_GLOB_PATHSPECS environment variable to 1. Disabling globbing on individual pathspecs can be done
           using pathspec magic ":(literal)"

       --noglob-pathspecs
           Add "literal" magic to all pathspec. This is equivalent to setting the GIT_NOGLOB_PATHSPECS environment variable to 1. Enabling globbing on individual pathspecs can be done
           using pathspec magic ":(glob)"

       --icase-pathspecs
           Add "icase" magic to all pathspec. This is equivalent to setting the GIT_ICASE_PATHSPECS environment variable to 1.

       --no-optional-locks
           Do not perform optional operations that require locks. This is equivalent to setting the GIT_OPTIONAL_LOCKS to 0.

       --list-cmds=group[,group...]
           List commands by group. This is an internal/experimental option and may change or be removed in the future. Supported groups are: builtins, parseopt (builtin commands that
           use parse-options), main (all commands in libexec directory), others (all other commands in $PATH that have git- prefix), list-<category> (see categories in command-list.txt), nohelpers (exclude helper commands), alias and config (retrieve command list from config variable completion.commands)

### GIT COMMANDS
       We divide Git into high level ("porcelain") commands and low level ("plumbing") commands.

### HIGH-LEVEL COMMANDS (PORCELAIN)
       We separate the porcelain commands into the main commands and some ancillary user utilities.

#### Main porcelain commands
       git-add(1)
           Add file contents to the index.

       git-am(1)
           Apply a series of patches from a mailbox.

       git-archive(1)
           Create an archive of files from a named tree.

       git-bisect(1)
           Use binary search to find the commit that introduced a bug.

       git-branch(1)
           List, create, or delete branches.

       git-bundle(1)
           Move objects and refs by archive.

       git-checkout(1)
           Switch branches or restore working tree files.

       git-cherry-pick(1)
           Apply the changes introduced by some existing commits.

       git-citool(1)
           Graphical alternative to git-commit.

       git-clean(1)
           Remove untracked files from the working tree.

       git-clone(1)
           Clone a repository into a new directory.

       git-commit(1)
           Record changes to the repository.

       git-describe(1)
           Give an object a human readable name based on an available ref.

       git-diff(1)
           Show changes between commits, commit and working tree, etc.

       git-fetch(1)
           Download objects and refs from another repository.

       git-format-patch(1)
           Prepare patches for e-mail submission.

       git-gc(1)
           Cleanup unnecessary files and optimize the local repository.

       git-grep(1)
           Print lines matching a pattern.

       git-gui(1)
           A portable graphical interface to Git.

       git-init(1)
           Create an empty Git repository or reinitialize an existing one.

       git-log(1)
           Show commit logs.

       git-merge(1)
           Join two or more development histories together.

       git-mv(1)
           Move or rename a file, a directory, or a symlink.

       git-notes(1)
           Add or inspect object notes.

       git-pull(1)
           Fetch from and integrate with another repository or a local branch.

       git-push(1)
           Update remote refs along with associated objects.

       git-range-diff(1)
           Compare two commit ranges (e.g. two versions of a branch).

       git-rebase(1)
           Reapply commits on top of another base tip.

       git-reset(1)
           Reset current HEAD to the specified state.

       git-revert(1)
           Revert some existing commits.

       git-rm(1)
           Remove files from the working tree and from the index.

       git-shortlog(1)
           Summarize git log output.

       git-show(1)
           Show various types of objects.

       git-stash(1)
           Stash the changes in a dirty working directory away.

       git-status(1)
		   Show the working tree status.

       git-submodule(1)
           Initialize, update or inspect submodules.

       git-tag(1)
           Create, list, delete or verify a tag object signed with GPG.

       git-worktree(1)
           Manage multiple working trees.

       gitk(1)
           The Git repository browser.

#### Ancillary Commands
       Manipulators:

       git-config(1)
           Get and set repository or global options.

       git-fast-export(1)
           Git data exporter.

       git-fast-import(1)
           Backend for fast Git data importers.

       git-filter-branch(1)
           Rewrite branches.

       git-mergetool(1)
           Run merge conflict resolution tools to resolve merge conflicts.

       git-pack-refs(1)
           Pack heads and tags for efficient repository access.

       git-prune(1)
           Prune all unreachable objects from the object database.

       git-reflog(1)
           Manage reflog information.

       git-remote(1)
           Manage set of tracked repositories.

       git-repack(1)
           Pack unpacked objects in a repository.

       git-replace(1)
           Create, list, delete refs to replace objects.

       Interrogators:

       git-annotate(1)
           Annotate file lines with commit information.

       git-blame(1)
		   Show what revision and author last modified each line of a file.

       git-count-objects(1)
           Count unpacked number of objects and their disk consumption.

       git-difftool(1)
           Show changes using common diff tools.

       git-fsck(1)
           Verifies the connectivity and validity of the objects in the database.

       git-help(1)
           Display help information about Git.

       git-instaweb(1)
           Instantly browse your working repository in gitweb.

       git-merge-tree(1)
           Show three-way merge without touching index.

       git-rerere(1)
           Reuse recorded resolution of conflicted merges.

       git-show-branch(1)
           Show branches and their commits.

       git-verify-commit(1)
           Check the GPG signature of commits.

       git-verify-tag(1)
           Check the GPG signature of tags.

       git-whatchanged(1)
           Show logs with difference each commit introduces.

       gitweb(1)
           Git web interface (web frontend to Git repositories).

#### Interacting with Others
       These commands are to interact with foreign SCM and with other people via patch over e-mail.

       git-archimport(1)
           Import a GNU Arch repository into Git.

       git-cvsexportcommit(1)
           Export a single commit to a CVS checkout.

       git-cvsimport(1)
           Salvage your data out of another SCM people love to hate.

       git-cvsserver(1)
           A CVS server emulator for Git.

       git-imap-send(1)
           Send a collection of patches from stdin to an IMAP folder.

	   git-p4(1)
           Import from and submit to Perforce repositories.

       git-quiltimport(1)
           Applies a quilt patchset onto the current branch.

       git-request-pull(1)
           Generates a summary of pending changes.

       git-send-email(1)
           Send a collection of patches as emails.

       git-svn(1)
           Bidirectional operation between a Subversion repository and Git.

### LOW-LEVEL COMMANDS (PLUMBING)
       Although Git includes its own porcelain layer, its low-level commands are sufficient to support development of alternative porcelains. Developers of such porcelains might start
       by reading about git-update-index(1) and git-read-tree(1).

       The interface (input, output, set of options and the semantics) to these low-level commands are meant to be a lot more stable than Porcelain level commands, because these
       commands are primarily for scripted use. The interface to Porcelain commands on the other hand are subject to change in order to improve the end user experience.

       The following description divides the low-level commands into commands that manipulate objects (in the repository, index, and working tree), commands that interrogate and
       compare objects, and commands that move objects and references between repositories.

#### Manipulation commands
       git-apply(1)
           Apply a patch to files and/or to the index.

       git-checkout-index(1)
           Copy files from the index to the working tree.

       git-commit-graph(1)
           Write and verify Git commit-graph files.

       git-commit-tree(1)
           Create a new commit object.

       git-hash-object(1)
           Compute object ID and optionally creates a blob from a file.

       git-index-pack(1)
           Build pack index file for an existing packed archive.

       git-merge-file(1)
           Run a three-way file merge.

       git-merge-index(1)
           Run a merge for files needing merging.

       git-mktag(1)
           Creates a tag object.

       git-mktree(1)
           Build a tree-object from ls-tree formatted text.

	   git-multi-pack-index(1)
           Write and verify multi-pack-indexes.

       git-pack-objects(1)
           Create a packed archive of objects.

       git-prune-packed(1)
           Remove extra objects that are already in pack files.

       git-read-tree(1)
           Reads tree information into the index.

       git-symbolic-ref(1)
           Read, modify and delete symbolic refs.

       git-unpack-objects(1)
           Unpack objects from a packed archive.

       git-update-index(1)
           Register file contents in the working tree to the index.

       git-update-ref(1)
           Update the object name stored in a ref safely.

       git-write-tree(1)
           Create a tree object from the current index.

#### Interrogation commands
       git-cat-file(1)
           Provide content or type and size information for repository objects.

       git-cherry(1)
           Find commits yet to be applied to upstream.

       git-diff-files(1)
           Compares files in the working tree and the index.

       git-diff-index(1)
           Compare a tree to the working tree or index.

       git-diff-tree(1)
           Compares the content and mode of blobs found via two tree objects.

       git-for-each-ref(1)
           Output information on each ref.

       git-get-tar-commit-id(1)
           Extract commit ID from an archive created using git-archive.

       git-ls-files(1)
           Show information about files in the index and the working tree.

       git-ls-remote(1)
           List references in a remote repository.

       git-ls-tree(1)
		   List the contents of a tree object.

       git-merge-base(1)
           Find as good common ancestors as possible for a merge.

       git-name-rev(1)
           Find symbolic names for given revs.

       git-pack-redundant(1)
           Find redundant pack files.

       git-rev-list(1)
           Lists commit objects in reverse chronological order.

       git-rev-parse(1)
           Pick out and massage parameters.

       git-show-index(1)
           Show packed archive index.

       git-show-ref(1)
           List references in a local repository.

       git-unpack-file(1)
           Creates a temporary file with a blob's contents.

       git-var(1)
           Show a Git logical variable.

       git-verify-pack(1)
           Validate packed Git archive files.

       In general, the interrogate commands do not touch the files in the working tree.

#### Synching repositories
       git-daemon(1)
           A really simple server for Git repositories.

       git-fetch-pack(1)
           Receive missing objects from another repository.

       git-http-backend(1)
           Server side implementation of Git over HTTP.

       git-send-pack(1)
           Push objects over Git protocol to another repository.

       git-update-server-info(1)
           Update auxiliary info file to help dumb servers.

       The following are helper commands used by the above; end users typically do not use them directly.

       git-http-fetch(1)
           Download from a remote Git repository via HTTP.

       git-http-push(1)
 		   Push objects over HTTP/DAV to another repository.

       git-parse-remote(1)
           Routines to help parsing remote repository access parameters.

       git-receive-pack(1)
           Receive what is pushed into the repository.

       git-shell(1)
           Restricted login shell for Git-only SSH access.

       git-upload-archive(1)
           Send archive back to git-archive.

       git-upload-pack(1)
           Send objects packed back to git-fetch-pack.

#### Internal helper commands
       These are internal helper commands used by other commands; end users typically do not use them directly.

       git-check-attr(1)
           Display gitattributes information.

       git-check-ignore(1)
           Debug gitignore / exclude files.

       git-check-mailmap(1)
           Show canonical names and email addresses of contacts.

       git-check-ref-format(1)
           Ensures that a reference name is well formed.

       git-column(1)
           Display data in columns.

       git-credential(1)
           Retrieve and store user credentials.

       git-credential-cache(1)
           Helper to temporarily store passwords in memory.

       git-credential-store(1)
           Helper to store credentials on disk.

       git-fmt-merge-msg(1)
           Produce a merge commit message.

       git-interpret-trailers(1)
           add or parse structured information in commit messages.

       git-mailinfo(1)
           Extracts patch and authorship from a single e-mail message.

       git-mailsplit(1)
           Simple UNIX mbox splitter program.

	   git-merge-one-file(1)
           The standard helper program to use with git-merge-index.

       git-patch-id(1)
           Compute unique ID for a patch.

       git-sh-i18n(1)
           Git's i18n setup code for shell scripts.

       git-sh-setup(1)
           Common Git shell script setup code.

       git-stripspace(1)
           Remove unnecessary whitespace.

### CONFIGURATION MECHANISM
       Git uses a simple text format to store customizations that are per repository and are per user. Such a configuration file may look like this:

           #
           # A '#' or ';' character indicates a comment.
           #

           ; core variables
           [core]
                   ; Don't trust file modes
                   filemode = false

           ; user identity
           [user]
                   name = "Junio C Hamano"
                   email = "gitster@pobox.com"

       Various commands read from the configuration file and adjust their operation accordingly. See git-config(1) for a list and more details about the configuration mechanism.

### IDENTIFIER TERMINOLOGY
       <object>
           Indicates the object name for any type of object.

       <blob>
           Indicates a blob object name.

       <tree>
           Indicates a tree object name.

       <commit>
           Indicates a commit object name.

       <tree-ish>
           Indicates a tree, commit or tag object name. A command that takes a <tree-ish> argument ultimately wants to operate on a <tree> object but automatically dereferences
           <commit> and <tag> objects that point at a <tree>.

       <commit-ish>
           Indicates a commit or tag object name. A command that takes a <commit-ish> argument ultimately wants to operate on a <commit> object but automatically dereferences <tag>
           objects that point at a <commit>.

       <type>
		   Indicates that an object type is required. Currently one of: blob, tree, commit, or tag.

       <file>
           Indicates a filename - almost always relative to the root of the tree structure GIT_INDEX_FILE describes.

### SYMBOLIC IDENTIFIERS
       Any Git command accepting any <object> can also use the following symbolic notation:

       HEAD
           indicates the head of the current branch.

       <tag>
           a valid tag name (i.e. a refs/tags/<tag> reference).

       <head>
           a valid head name (i.e. a refs/heads/<head> reference).

       For a more complete list of ways to spell object names, see "SPECIFYING REVISIONS" section in gitrevisions(7).

### FILE/DIRECTORY STRUCTURE
       Please see the gitrepository-layout(5) document.

       Read githooks(5) for more details about each hook.

       Higher level SCMs may provide and manage additional information in the $GIT_DIR.

### TERMINOLOGY
       Please see gitglossary(7).

### ENVIRONMENT VARIABLES
       Various Git commands use the following environment variables:

#### The Git Repository
       These environment variables apply to all core Git commands. Nb: it is worth noting that they may be used/overridden by SCMS sitting above Git so take care if using a foreign
       front-end.

       GIT_INDEX_FILE
           This environment allows the specification of an alternate index file. If not specified, the default of $GIT_DIR/index is used.

       GIT_INDEX_VERSION
           This environment variable allows the specification of an index version for new repositories. It won't affect existing index files. By default index file version 2 or 3 is
           used. See git-update-index(1) for more information.

       GIT_OBJECT_DIRECTORY
           If the object storage directory is specified via this environment variable then the sha1 directories are created underneath - otherwise the default $GIT_DIR/objects
           directory is used.

       GIT_ALTERNATE_OBJECT_DIRECTORIES
           Due to the immutable nature of Git objects, old objects can be archived into shared, read-only directories. This variable specifies a ":" separated (on Windows ";"
           separated) list of Git object directories which can be used to search for Git objects. New objects will not be written to these directories.

           Entries that begin with " (double-quote) will be interpreted as C-style quoted paths, removing leading and trailing double-quotes and respecting backslash escapes. E.g.,
           the value "path-with-\"-and-:-in-it":vanilla-path has two paths: path-with-"-and-:-in-it and vanilla-path.

       GIT_DIR
           If the GIT_DIR environment variable is set then it specifies a path to use instead of the default .git for the base of the repository. The --git-dir command-line option also sets this value.

       GIT_WORK_TREE
           Set the path to the root of the working tree. This can also be controlled by the --work-tree command-line option and the core.worktree configuration variable.

       GIT_NAMESPACE
           Set the Git namespace; see gitnamespaces(7) for details. The --namespace command-line option also sets this value.

       GIT_CEILING_DIRECTORIES
           This should be a colon-separated list of absolute paths. If set, it is a list of directories that Git should not chdir up into while looking for a repository directory
           (useful for excluding slow-loading network directories). It will not exclude the current working directory or a GIT_DIR set on the command line or in the environment.
           Normally, Git has to read the entries in this list and resolve any symlink that might be present in order to compare them with the current directory. However, if even this
           access is slow, you can add an empty entry to the list to tell Git that the subsequent entries are not symlinks and needn't be resolved; e.g.,
           GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink.

       GIT_DISCOVERY_ACROSS_FILESYSTEM
           When run in a directory that does not have ".git" repository directory, Git tries to find such a directory in the parent directories to find the top of the working tree,
           but by default it does not cross filesystem boundaries. This environment variable can be set to true to tell Git not to stop at filesystem boundaries. Like
           GIT_CEILING_DIRECTORIES, this will not affect an explicit repository directory set via GIT_DIR or on the command line.

       GIT_COMMON_DIR
           If this variable is set to a path, non-worktree files that are normally in $GIT_DIR will be taken from this path instead. Worktree-specific files such as HEAD or index are
           taken from $GIT_DIR. See gitrepository-layout(5) and git-worktree(1) for details. This variable has lower precedence than other path variables such as GIT_INDEX_FILE,
           GIT_OBJECT_DIRECTORY...

#### Git Commits
       GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, GIT_AUTHOR_DATE, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL, GIT_COMMITTER_DATE, EMAIL
           see git-commit-tree(1)

#### Git Diffs
       GIT_DIFF_OPTS
           Only valid setting is "--unified=??" or "-u??" to set the number of context lines shown when a unified diff is created. This takes precedence over any "-U" or "--unified"
           option value passed on the Git diff command line.

       GIT_EXTERNAL_DIFF
           When the environment variable GIT_EXTERNAL_DIFF is set, the program named by it is called, instead of the diff invocation described above. For a path that is added,
           removed, or modified, GIT_EXTERNAL_DIFF is called with 7 parameters:

               path old-file old-hex old-mode new-file new-hex new-mode

           where:

       <old|new>-file
           are files GIT_EXTERNAL_DIFF can use to read the contents of <old|new>,

       <old|new>-hex
           are the 40-hexdigit SHA-1 hashes,

       <old|new>-mode
           are the octal representation of the file modes.

           The file parameters can point at the user's working file (e.g.  new-file in "git-diff-files"), /dev/null (e.g.  old-file when a new file is added), or a temporary file
           (e.g.  old-file in the index).  GIT_EXTERNAL_DIFF should not worry about unlinking the temporary file --- it is removed when GIT_EXTERNAL_DIFF exits.

           For a path that is unmerged, GIT_EXTERNAL_DIFF is called with 1 parameter, <path>.

 		   For each path GIT_EXTERNAL_DIFF is called, two environment variables, GIT_DIFF_PATH_COUNTER and GIT_DIFF_PATH_TOTAL are set.

       GIT_DIFF_PATH_COUNTER
           A 1-based counter incremented by one for every path.

       GIT_DIFF_PATH_TOTAL
           The total number of paths.

#### other
       GIT_MERGE_VERBOSITY
           A number controlling the amount of output shown by the recursive merge strategy. Overrides merge.verbosity. See git-merge(1)

       GIT_PAGER
           This environment variable overrides $PAGER. If it is set to an empty string or to the value "cat", Git will not launch a pager. See also the core.pager option in git-
           config(1).

       GIT_EDITOR
           This environment variable overrides $EDITOR and $VISUAL. It is used by several Git commands when, on interactive mode, an editor is to be launched. See also git-var(1) and
           the core.editor option in git-config(1).

       GIT_SSH, GIT_SSH_COMMAND
           If either of these environment variables is set then git fetch and git push will use the specified command instead of ssh when they need to connect to a remote system. The
           command-line parameters passed to the configured command are determined by the ssh variant. See ssh.variant option in git-config(1) for details.

       + $GIT_SSH_COMMAND takes precedence over $GIT_SSH, and is interpreted by the shell, which allows additional arguments to be included. $GIT_SSH on the other hand must be just
       the path to a program (which can be a wrapper shell script, if additional arguments are needed).

       + Usually it is easier to configure any desired options through your personal .ssh/config file. Please consult your ssh documentation for further details.

       GIT_SSH_VARIANT
           If this environment variable is set, it overrides Git's autodetection whether GIT_SSH/GIT_SSH_COMMAND/core.sshCommand refer to OpenSSH, plink or tortoiseplink. This
           variable overrides the config setting ssh.variant that serves the same purpose.

       GIT_ASKPASS
           If this environment variable is set, then Git commands which need to acquire passwords or passphrases (e.g. for HTTP or IMAP authentication) will call this program with a
           suitable prompt as command-line argument and read the password from its STDOUT. See also the core.askPass option in git-config(1).

       GIT_TERMINAL_PROMPT
           If this environment variable is set to 0, git will not prompt on the terminal (e.g., when asking for HTTP authentication).

       GIT_CONFIG_NOSYSTEM
           Whether to skip reading settings from the system-wide $(prefix)/etc/gitconfig file. This environment variable can be used along with $HOME and $XDG_CONFIG_HOME to create a
           predictable environment for a picky script, or you can set it temporarily to avoid using a buggy /etc/gitconfig file while waiting for someone with sufficient permissions
           to fix it.

       GIT_FLUSH
           If this environment variable is set to "1", then commands such as git blame (in incremental mode), git rev-list, git log, git check-attr and git check-ignore will force a
           flush of the output stream after each record have been flushed. If this variable is set to "0", the output of these commands will be done using completely buffered I/O. If
           this environment variable is not set, Git will choose buffered or record-oriented flushing based on whether stdout appears to be redirected to a file or not.

       GIT_TRACE
           Enables general trace messages, e.g. alias expansion, built-in command execution and external command execution.

           If this variable is set to "1", "2" or "true" (comparison is case insensitive), trace messages will be printed to stderr.

           If the variable is set to an integer value greater than 2 and lower than 10 (strictly) then Git will interpret this value as an open file descriptor and will try to write the trace messages into this file descriptor.

           Alternatively, if the variable is set to an absolute path (starting with a / character), Git will interpret this as a file path and will try to append the trace messages to
           it.

           Unsetting the variable, or setting it to empty, "0" or "false" (case insensitive) disables trace messages.

       GIT_TRACE_FSMONITOR
           Enables trace messages for the filesystem monitor extension. See GIT_TRACE for available trace output options.

       GIT_TRACE_PACK_ACCESS
           Enables trace messages for all accesses to any packs. For each access, the pack file name and an offset in the pack is recorded. This may be helpful for troubleshooting
           some pack-related performance problems. See GIT_TRACE for available trace output options.

       GIT_TRACE_PACKET
           Enables trace messages for all packets coming in or out of a given program. This can help with debugging object negotiation or other protocol issues. Tracing is turned off
           at a packet starting with "PACK" (but see GIT_TRACE_PACKFILE below). See GIT_TRACE for available trace output options.

       GIT_TRACE_PACKFILE
           Enables tracing of packfiles sent or received by a given program. Unlike other trace output, this trace is verbatim: no headers, and no quoting of binary data. You almost
           certainly want to direct into a file (e.g., GIT_TRACE_PACKFILE=/tmp/my.pack) rather than displaying it on the terminal or mixing it with other trace output.

           Note that this is currently only implemented for the client side of clones and fetches.

       GIT_TRACE_PERFORMANCE
           Enables performance related trace messages, e.g. total execution time of each Git command. See GIT_TRACE for available trace output options.

       GIT_TRACE_SETUP
           Enables trace messages printing the .git, working tree and current working directory after Git has completed its setup phase. See GIT_TRACE for available trace output
           options.

       GIT_TRACE_SHALLOW
           Enables trace messages that can help debugging fetching / cloning of shallow repositories. See GIT_TRACE for available trace output options.

       GIT_TRACE_CURL
           Enables a curl full trace dump of all incoming and outgoing data, including descriptive information, of the git transport protocol. This is similar to doing curl
           --trace-ascii on the command line. This option overrides setting the GIT_CURL_VERBOSE environment variable. See GIT_TRACE for available trace output options.

       GIT_TRACE_CURL_NO_DATA
           When a curl trace is enabled (see GIT_TRACE_CURL above), do not dump data (that is, only dump info lines and headers).

       GIT_REDACT_COOKIES
           This can be set to a comma-separated list of strings. When a curl trace is enabled (see GIT_TRACE_CURL above), whenever a "Cookies:" header sent by the client is dumped,
           values of cookies whose key is in that list (case-sensitive) are redacted.

       GIT_LITERAL_PATHSPECS
           Setting this variable to 1 will cause Git to treat all pathspecs literally, rather than as glob patterns. For example, running GIT_LITERAL_PATHSPECS=1 git log -- '*.c' will
           search for commits that touch the path *.c, not any paths that the glob *.c matches. You might want this if you are feeding literal paths to Git (e.g., paths previously
           given to you by git ls-tree, --raw diff output, etc).

       GIT_GLOB_PATHSPECS
           Setting this variable to 1 will cause Git to treat all pathspecs as glob patterns (aka "glob" magic).

       GIT_NOGLOB_PATHSPECS
           Setting this variable to 1 will cause Git to treat all pathspecs as literal (aka "literal" magic).

	   GIT_ICASE_PATHSPECS
           Setting this variable to 1 will cause Git to treat all pathspecs as case-insensitive.

       GIT_REFLOG_ACTION
           When a ref is updated, reflog entries are created to keep track of the reason why the ref was updated (which is typically the name of the high-level command that updated
           the ref), in addition to the old and new values of the ref. A scripted Porcelain command can use set_reflog_action helper function in git-sh-setup to set its name to this
           variable when it is invoked as the top level command by the end user, to be recorded in the body of the reflog.

       GIT_REF_PARANOIA
           If set to 1, include broken or badly named refs when iterating over lists of refs. In a normal, non-corrupted repository, this does nothing. However, enabling it may help
           git to detect and abort some operations in the presence of broken refs. Git sets this variable automatically when performing destructive operations like git-prune(1). You
           should not need to set it yourself unless you want to be paranoid about making sure an operation has touched every ref (e.g., because you are cloning a repository to make a
           backup).

       GIT_ALLOW_PROTOCOL
           If set to a colon-separated list of protocols, behave as if protocol.allow is set to never, and each of the listed protocols has protocol.<name>.allow set to always
           (overriding any existing configuration). In other words, any protocol not mentioned will be disallowed (i.e., this is a whitelist, not a blacklist). See the description of
           protocol.allow in git-config(1) for more details.

       GIT_PROTOCOL_FROM_USER
           Set to 0 to prevent protocols used by fetch/push/clone which are configured to the user state. This is useful to restrict recursive submodule initialization from an
           untrusted repository or for programs which feed potentially-untrusted URLS to git commands. See git-config(1) for more details.

       GIT_PROTOCOL
           For internal use only. Used in handshaking the wire protocol. Contains a colon : separated list of keys with optional values key[=value]. Presence of unknown keys and
           values must be ignored.

       GIT_OPTIONAL_LOCKS
           If set to 0, Git will complete any requested operation without performing any optional sub-operations that require taking a lock. For example, this will prevent git status
           from refreshing the index as a side effect. This is useful for processes running in the background which do not want to cause lock contention with other operations on the
           repository. Defaults to 1.

       GIT_REDIRECT_STDIN, GIT_REDIRECT_STDOUT, GIT_REDIRECT_STDERR
           Windows-only: allow redirecting the standard input/output/error handles to paths specified by the environment variables. This is particularly useful in multi-threaded
           applications where the canonical way to pass standard handles via CreateProcess() is not an option because it would require the handles to be marked inheritable (and
           consequently every spawned process would inherit them, possibly blocking regular Git operations). The primary intended use case is to use named pipes for communication
           (e.g.  \\.\pipe\my-git-stdin-123).

           Two special values are supported: off will simply close the corresponding standard handle, and if GIT_REDIRECT_STDERR is 2>&1, standard error will be redirected to the same
           handle as standard output.

       GIT_PRINT_SHA1_ELLIPSIS (deprecated)
           If set to yes, print an ellipsis following an (abbreviated) SHA-1 value. This affects indications of detached HEADs (git-checkout(1)) and the raw diff output (git-diff(1)).
           Printing an ellipsis in the cases mentioned is no longer considered adequate and support for it is likely to be removed in the foreseeable future (along with the variable).

### DISCUSSION
       More detail on the following is available from the Git concepts chapter of the user-manual[2] and gitcore-tutorial(7).

       A Git project normally consists of a working directory with a ".git" subdirectory at the top level. The .git directory contains, among other things, a compressed object
       database representing the complete history of the project, an "index" file which links that history to the current contents of the working tree, and named pointers into that
       history such as tags and branch heads.

       The object database contains objects of three main types: blobs, which hold file data; trees, which point to blobs and other trees to build up directory hierarchies; and
       commits, which each reference a single tree and some number of parent commits.

       The commit, equivalent to what other systems call a "changeset" or "version", represents a step in the project's history, and each parent represents an immediately preceding step. Commits with more than one parent represent merges of independent lines of development.

       All objects are named by the SHA-1 hash of their contents, normally written as a string of 40 hex digits. Such names are globally unique. The entire history leading up to a
       commit can be vouched for by signing just that commit. A fourth object type, the tag, is provided for this purpose.

       When first created, objects are stored in individual files, but for efficiency may later be compressed together into "pack files".

       Named pointers called refs mark interesting points in history. A ref may contain the SHA-1 name of an object or the name of another ref. Refs with names beginning ref/head/
       contain the SHA-1 name of the most recent commit (or "head") of a branch under development. SHA-1 names of tags of interest are stored under ref/tags/. A special ref named HEAD
       contains the name of the currently checked-out branch.

       The index file is initialized with a list of all paths and, for each path, a blob object and a set of attributes. The blob object represents the contents of the file as of the
       head of the current branch. The attributes (last modified time, size, etc.) are taken from the corresponding file in the working tree. Subsequent changes to the working tree
       can be found by comparing these attributes. The index may be updated with new content, and new commits may be created from the content stored in the index.

       The index is also capable of storing multiple entries (called "stages") for a given pathname. These stages are used to hold the various unmerged version of a file when a merge
       is in progress.

### FURTHER DOCUMENTATION
       See the references in the "description" section to get started using Git. The following is probably more detail than necessary for a first-time user.

       The Git concepts chapter of the user-manual[2] and gitcore-tutorial(7) both provide introductions to the underlying Git architecture.

       See gitworkflows(7) for an overview of recommended workflows.

       See also the howto[3] documents for some useful examples.

       The internals are documented in the Git API documentation[4].

       Users migrating from CVS may also want to read gitcvs-migration(7).

### AUTHORS
       Git was started by Linus Torvalds, and is currently maintained by Junio C Hamano. Numerous contributions have come from the Git mailing list <git@vger.kernel.org[5]>.
       http://www.openhub.net/p/git/contributors/summary gives you a more complete list of contributors.

       If you have a clone of git.git itself, the output of git-shortlog(1) and git-blame(1) can show you the authors for specific parts of the project.

### REPORTING BUGS
       Report bugs to the Git mailing list <git@vger.kernel.org[5]> where the development and maintenance is primarily done. You do not have to be subscribed to the list to send a
       message there. See the list archive at https://public-inbox.org/git for previous bug reports and other discussions.

       Issues which are security relevant should be disclosed privately to the Git Security mailing list <git-security@googlegroups.com[6]>.

### SEE ALSO
       gittutorial(7), gittutorial-2(7), giteveryday(7), gitcvs-migration(7), gitglossary(7), gitcore-tutorial(7), gitcli(7), The Git User's Manual[1], gitworkflows(7)

### GIT
       Part of the git(1) suite

### NOTES
        1. Git User's Manual
           git-htmldocs/user-manual.html

        2. Git concepts chapter of the user-manual
           git-htmldocs/user-manual.html#git-concepts

        3. howto
           git-htmldocs/howto-index.html

        4. Git API documentation
           git-htmldocs/technical/api-index.html

        5. git@vger.kernel.org
           mailto:git@vger.kernel.org

        6. git-security@googlegroups.com
           mailto:git-security@googlegroups.com

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