If you haven't GNU `grep` available, here is something more portable:

    grepc()
    {
      pattern=$1
      shift
      esc=$(printf "\033")
      sed 's"'"$pattern"'"'$esc'[32m&'$esc'[0m"g' "$@"
    }

You can customize the color using one of these codes


    30m	black
    31m	red
    32m	green
    33m	yellow
    34m	blue
    35m	magenta
    36m	cyan
    37m	white

Using `7m` instead of a color code will put the string in reverse video.