Put your Git branch in your Mac or Linux prompt

There is a lot of examples out there but here's a basic way to show your Git branch in your profile.

First, edit your .bash_profile.

$ vi .bash_profile

Press "i" to put vi in "insert mode".  Then, add the following to your .bash_profile:

ps1_git_branch() {
git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}
export PS1="\w\$(ps1_git_branch)\$ "

After making this change and starting a new Terminal, the prompt will show the following in non-Git folders:

~/Documents $

In Git folders, the prompt will show the following (if you are on the "master" branch):

~/Documents/git/code (master)$

Very convenient.