bash script to colorize diff output, kind of like git does

gdiff.sh

#!/bin/bash

RED=`echo -e '\033[31m'`
GREEN=`echo -e '\033[32m'`
BLUE=`echo -e '\033[36m'`
YELLOW=`echo -e '\033[33m'`
NORMAL=`echo -e '\033[0m'`

diff -uN $@ \
    | sed "s/^@@.*@@/$BLUE&$NORMAL/g" \
    | sed "s/^\+[^+].*/$GREEN&$NORMAL/g" \
    | sed "s/^\-[^-].*/$RED&$NORMAL/g" \
    | sed "s/^\+\+\+/$GREEN&$NORMAL/g" \
    | sed "s/^\-\-\-/$RED&$NORMAL/g" \
    | less -R

ok. very good