Customize bash prompt based on current cwd/environment

.bashrc

# You want your prompt to warn you if you are in the directory tree of a production environment.
# Set the `LIVE_DIRS` array to the list of whatever directories should be considered production,
# and your prompt will contain a big, red "[PRODUCTION]" whenever you're in one of those directories,
# or a subdirectory thereof.

# Customize this variable
LIVE_DIRS=(/var/www/example.com /var/www/example2.com)

cwdEnvironment() {
        local _live
        _live=''

        for d in "${LIVE_DIRS[@]}" ; do
                if [[ `pwd` =~ ^"$d".*$ ]] ; then
                        _live=' [PRODUCTION]'
                fi
        done
        printf -- '%s' "$_live"
        return 0
}

# The important part here is the `\[$(tput bold 1)\]\e[0:31m$(cwdEnvironment)\e[m\[$(tput sgr0)\]` - that's the bold, red part
export PS1='[\u@\h \W]\[$(tput bold 1)\]\e[0:31m$(cwdEnvironment)\e[m\[$(tput sgr0)\] \$ '