export COLOR_RED="$(tput setaf 1)"
export COLOR_RESET="$(tput sgr0)"

exec 9>&2
exec 8> >(
    while IFS='' read -r -d $'\0' line || [ -n "$line" ]; do
       echo -ne "${COLOR_RED}${line}${COLOR_RESET}"
    done
)
function undirect(){ echo -ne '\0' >&8; exec 2>&9; } # reset to original 9 (==2)
function redirect(){ exec 2>&8; } # set to custom 8
trap "redirect;" DEBUG
PROMPT_COMMAND='undirect;'