Display git branch in bash prompt

.bashrc

# If you work with git, you've probably had that nagging sensation of not knowing what branch you are on. Worry no longer!

#export PS1="\\w:\$(git branch 2>/dev/null | grep '^*' | colrm 1 2)\$ "
# This is easy
export PS1="\w\$(__git_ps1 '(%s)') \$ "

# This will change your prompt to display not only your working directory but also your current git branch, if you have one. Pretty nifty!

# ~/code/web:beta_directory$ git checkout master
# Switched to branch "master"
# ~/code/web:master$ git checkout beta_directory
# Switched to branch "beta_directory"
# ~/code/web:beta_directory$ 

You can also use this:

export PS1="\w$(__git_ps1 '(%s)') $ "