display current git branch in terminal prompt

git_branch_in_terminal_prompt.sh

#!/bin/bash

# to display current git branch in terminal prompt on start of session add this to your ~/.bashrc file
# ex.: if you are in folder which is git repository switched to master branch your prompt will look like
# /home/joe [master] _
#
# source http://perltricks.com/article/displaying-the-git-branch-in-the-terminal-prompt-with-perl/

function current_git_branch {
  git branch 2> /dev/null | perl -ne 'print " [$_]" if s/^\*\s+// && chomp'
}
PS1="\w\$(current_git_branch) "