之前在windows上开发，下载git后，可以在工程目录下“右键” > Git Bash Here 打开git的bash命令行窗口，在该命令行窗口中有命令行补全功能（例如：输入 git push origin 后介入tab键会自动带出来分之名字）。此外，也可以“右键”>Git GUI Here 打开git的图形化界面，或者在git bash上直接输入git gui调出图形化界面，方面add和commit操作。
在mac上安装完git后，可以在iterm中输入git gui 调出git的图形界面，但是找不到git bash命令行来，在mac的命令行中又没有git命令的自动补全功能。不过，可以通过如下方法解决：
1、安装bash-completion：
1）查看是否安装：
$ brew list
autoconf bash-completion libidn2 libunistring lrzsz pkg-config wget
automake gettext libtool libyaml openssl@1.1 readline
如果没有安装，通过如下方式安装：
brew install bash-completion
2、配置：
1）安装后，通过如下命令查看；
$ brew info bash-completion
bash-completion: stable 1.3 (bottled)
Programmable completion for Bash 3.2
https://salsa.debian.org/debian/bash-completion
Conflicts with:
bash-completion@2 (because each are different versions of the same formula)
/usr/local/Cellar/bash-completion/1.3_3 (189 files, 608.6KB) *
Poured from bottle on 2021-01-28 at 20:53:57
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/bash-completion.rb
==> Caveats
Add the following line to your ~/.bash_profile:
[[ -r "/usr/local/etc/profile.d/bash_completion.sh" ]] && . "/usr/local/etc/profile.d/bash_completion.sh"
Bash completion has been installed to:
/usr/local/etc/bash_completion.d
==> Analytics
install: 9,194 (30 days), 26,722 (90 days), 124,363 (365 days)
install-on-request: 8,065 (30 days), 24,047 (90 days), 113,585 (365 days)
从提示中将[[ -r "/usr/local/etc/profile.d/bash_completion.sh" ]] && . "/usr/local/etc/profile.d/bash_completion.sh" 拷贝到 ~/.bash_profile中。
2）下载git-completion.bash：
https://github.com/git/git/tree/master/contrib/completion
下载git-completion.bash，将其保存到~下，并且重命名为.git-completion.bash
3）编辑~/.bash_profile，并将添加：
source ~/.git-completion.bash
