bash_prompt_simple

bash_prompt_simple.sh

__bash_prompt_simple() {
    local e=$? p a o i ee faint=$'\e[2m' err=$'\e[31m' esc=$'\e[0m' bold=$'\e[1m' op='\[' cl='\]'
    [[ $PWD == "$HOME"* ]] && p="~${PWD#$HOME}" || p=$PWD
    IFS=/ read -ra a<<<"$p"; o=${a[0]}
    for((i=1;i<${#a[@]}-1;i++)); do [[ ${a[i]} ]] && o+="$op$faint$cl/$op$esc$cl${a[i]:0:1}"; done
    [[ ${#a[@]} -gt 1 ]] && o+="$op$faint$cl/$op$esc$cl$op$bold$cl${a[-1]}$op$esc$cl"
    [[ $e != 0 ]] && ee=" $op$err$cl$e$op$esc$cl" || ee=""
    PS1="$o$ee $op$faint$cl\$$op$esc$cl "
};

PROMPT_COMMAND=__bash_prompt_simple

basically only does two things:

1. truncates the path by letter
2. shows previous non-zero exit codes