highlight

#!/bin/bash
#
#  highlight
#
#  Highlight matching lines in the input. Like a less aggressive grep.
#

RED=$(echo -e '\033[31m')
NORMAL=$(echo -e '\033[00m')

function usage()
{
  echo 'Usage: highlight <regex>'
  echo
  echo 'Highlights any input lines which match in red.'
  echo
}

function highlight()
{
  exec sed -u "s/${1}/${RED}\0${NORMAL}/g"
}

if [ $# != 1 ]; then
  usage 1>&2
  exit 1
fi

highlight "$1"