Display the current git branch in your command prompt with username and dir., Adds an asterisk if there are unstaged updates.

.bashrc

# Add this to your .bashrc
# Will produce command line prompts like in git repositories 
#         <username>@<hostname>:<directory>(branch) $
# and like this elsewhere.
#         <username>@<hostname>:<directory> $
# If there are unstaged changes in the repository, there will be an asterisk next to the branch name:
#         <username>@<hostname>:<directory>(branch) $
# taken from https://gist.github.com/johnpbloch/3406013

# Trim path https://unix.stackexchange.com/a/26950/270668
export PROMPT_DIRTRIM=1 

parse_git_branch() {
    hasmod=""
    if [[ $(git ls-files -dmo --exclude-standard 2> /dev/null) ]]; then
        hasmod="*"
    fi
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \\(.*\\)/(\\1$hasmod)/"
}
export PS1="\[\e[46m\]\[\e[30m\]\\u@\\h\[\e[01;00m\]:\[\e[43m\]\[\e[30m\]\\w\[\e[42m\]\[\e[30m\]\$(parse_git_branch)\[\e[01;00m\] $ "