How do I alias commands in git?

Follwing are the 4 git shortcuts or aliases youc an use to save time.

Open the commandline and type these below 4 commands and use the shortcuts after.

git config --global alias.co checkout  
git config --global alias.ci commit    
git config --global alias.st status    
git config --global alias.br branch  

Now test them!

$ git co              # use git co instead of git checkout
$ git ci              # use git ci instead of git commit
$ git st              # use git st instead of git status
$ git br              # use git br instead of git branch

I think the most useful gitconfig is like this,we always use the 20% function in git,you can try the "g ll",it is amazing,the details:

[user]
    name = wcc526
    email = 949409306@qq.com
[core]  
    editor = vi 
[alias]
    aa = add --all
    bv = branch -vv
    ba = branch -ra
    bd = branch -d
    ca = commit --amend
    cb = checkout -b
    cm = commit -a --amend -C HEAD
    ci = commit -a -v
    co = checkout
    di = diff
    ll = log --pretty=format:"%C(yellow)%h%Cred%d\\ %Creset%s%Cblue\\ [%cn]" --decorate --numstat
    ld = log --pretty=format:"%C(yellow)%h\\ %C(green)%ad%Cred%d\\ %Creset%s%Cblue\\ [%cn]" --decorate --date=short --graph
    ls = log --pretty=format:"%C(green)%h\\ %C(yellow)[%ad]%Cred%d\\ %Creset%s%Cblue\\ [%cn]" --decorate --date=relative
    mm = merge --no-ff
    st = status --short --branch
    tg = tag -a 
    pu = push --tags
    un = reset --hard HEAD  
    uh = reset --hard HEAD^
   [color]  
    diff = auto  
    status = auto  
    branch = auto 
   [branch]  
    autosetuprebase = always

It is given here Aliases.Even there are great answers here, I added this because it differs in windows and linux

This worked for me:

bco = "!f(){ git branch ${1} && git checkout ${1}; };f"

on:

$ git --version

git version 1.7.7.5 (Apple Git-26)

As others have said the appropriate way to add git aliases is in your global .gitconfig file either by editing ~/.gitconfig or by using the git config --global alias.<alias> <git-command> command

Below is a copy of the alias section of my ~/.gitconfig file:

[alias]
    st = status
    ci = commit
    co = checkout
    br = branch
    unstage = reset HEAD --
    last = log -1 HEAD

Also, if you're using bash, I would recommend setting up bash completion by copying git-completion.bash to your home directory and sourcing it from your ~/.bashrc. (I believe I learned about this from the Pro Git online book.) On Mac OS X, I accomplished this with the following commands:

# Copy git-completion.bash to home directory
cp usr/local/git/contrib/completion/git-completion.bash ~/

# Add the following lines to ~/.bashrc
if [ -x /usr/local/git/bin/git ]; then
    source ~/.git-completion.bash
fi

Note: The bash completion will work not only for the standard git commands but also for your git aliases.

Finally, to really cut down on the keystrokes, I added the following to my ~/.bash_aliases file, which is sourced from ~/.bashrc:

alias gst='git status'
alias gl='git pull'
alias gp='git push'
alias gd='git diff | mate'
alias gau='git add --update'
alias gc='git commit -v'
alias gca='git commit -v -a'
alias gb='git branch'
alias gba='git branch -a'
alias gco='git checkout'
alias gcob='git checkout -b'
alias gcot='git checkout -t'
alias gcotb='git checkout --track -b'
alias glog='git log'
alias glogp='git log --pretty=format:"%h %s" --graph'

$ git update
git: 'update' is not a git command. See 'git --help'.

Did you mean this?
    update-ref

$ git config --global alias.update 'pull -v'

$ git update
From git://git.kernel.org/pub/scm/git/git
 = [up to date]      html       -> origin/html
 = [up to date]      maint      -> origin/maint
 = [up to date]      man        -> origin/man
 = [up to date]      master     -> origin/master
 = [up to date]      next       -> origin/next
 = [up to date]      pu         -> origin/pu
 = [up to date]      todo       -> origin/todo
Already up-to-date.

You need the git config alias command. Execute the following in a Git repository:

git config alias.ci commit

For global alias:

git config --global alias.ci commit

This will create an alias st for status:

git config --add alias.st status