bash: print stderr in red color

Question

Is there a way to make bash display stderr messages in red color?

Answer 1

command 2> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done)

Answer 2

You can also check out stderred: https://github.com/sickill/stderred

Answer 3

http://sourceforge.net/projects/hilite/

Answer 4

I've made a wrapper script that implements Balázs Pozsár's answer in pure bash. Save it in your $PATH and prefix commands to colorize their output.

    #!/bin/bash

    if [ $1 == "--help" ] ; then
        echo "Executes a command and colorizes all errors occured"
        echo "Example: `basename ${0}` wget ..."
        echo "(c) o_O Tync, ICQ# 1227-700, Enjoy!"
        exit 0
        fi

    # Temp file to catch all errors
    TMP_ERRS=$(mktemp)

    # Execute command
    "$@" 2> >(while read line; do echo -e "\e[01;31m$line\e[0m" | tee --append $TMP_ERRS; done)
    EXIT_CODE=$?

    # Display all errors again
    if [ -s "$TMP_ERRS" ] ; then
        echo -e "\n\n\n\e[01;31m === ERRORS === \e[0m"
        cat $TMP_ERRS
        fi
    rm -f $TMP_ERRS

    # Finish
    exit $EXIT_CODE

Answer 5

You can use a function like this

 #!/bin/sh

color() {
      printf '\033[%sm%s\033[m\n' "$@"
      # usage color "31;5" "string"
      # 0 default
      # 5 blink, 1 strong, 4 underlined
      # fg: 31 red,  32 green, 33 yellow, 34 blue, 35 purple, 36 cyan, 37 white
      # bg: 40 black, 41 red, 44 blue, 45 purple
      }
string="Hello world!"
color '31;1' "$string"