watch_log.sh

#!/bin/bash

if [ $# -eq 0 ]; then
    echo "$0 /path/to/log"
    exit
fi

# Escaped color codes
     BLACK=`echo -e '\033[0;30m'`
   DK_GREY=`echo -e '\033[1;30m'`
       RED=`echo -e '\033[0;31m'`
      PINK=`echo -e '\033[1;31m'`
     GREEN=`echo -e '\033[0;32m'`
  LT_GREEN=`echo -e '\033[1;32m'`
     BROWN=`echo -e '\033[0;33m'`
    YELLOW=`echo -e '\033[1;33m'`
      BLUE=`echo -e '\033[0;34m'`
   LT_BLUE=`echo -e '\033[1;34m'`
    PURPLE=`echo -e '\033[0;35m'`
 LT_PURPLE=`echo -e '\033[1;35m'`
      CYAN=`echo -e '\033[0;36m'`
   LT_CYAN=`echo -e '\033[1;36m'`
   LT_GREY=`echo -e '\033[0;37m'`
     WHITE=`echo -e '\033[1;37m'`
COLOR_NONE=`echo -e '\033[0m'`


tail -f $1 | sed \
    -e "/GET \/favicon.ico/d" \
    -e "s/^.* 40[012356789] .*$/$PINK&$COLOR_NONE/" \
    -e "s/^.* 404 .*$/$BROWN&$COLOR_NONE/" \
    -e "s/^.* 500 .*$/$PURPLE&$COLOR_NONE/"