Proof of Concept : Pipe (and color output for proof) of stderr only

pipe_stderr_only.sh

#!/bin/bash

function outerr {
  echo "this is on standard ouput (blank color)"
  echo "but this one is on error ouput (red color)" >&2
}

exec 3>&1
outerr 2>&1 >&3 | sed -e 's/^/'$(printf "\033[1;31m")'/' -e 's/$/'$(printf "\033[39m")'/'
exec 3>&-

: <<SUCCESSFULLY_TESTED_ON

bash$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04 LTS
Release:        12.04
Codename:       precise

bash$ uname -a
Linux precise32 3.2.0-23-generic-pae #36-Ubuntu SMP Tue Apr 10 22:19:09 UTC 2012 i686 i686 i386 GNU/Linux

SUCCESSFULLY_TESTED_ON