Bash configuration to get its prompt to display the current Git branch.

.bash_profile

# ...

# Add these lines at the end of your ~/.bash_profile

# Git functions (used to define a custom prompt)
function parse_git_dirty {
[[ $(git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] && echo "*"
}
function parse_git_branch {
git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/[\1$(parse_git_dirty)]/"
}

# Define a custom prompt which displays the current git branch,
# and a star if the branch holds uncommitted changes.
PS1='\u@\h:\w$(parse_git_branch)$ '