Better diff for comparing directories (compares file dates)

mdiff.sh

#!/bin/bash

# Better diff for directories

if [ "$#" -ne 2 ]; then
    echo -e "Usage:\t./mdiff.sh <dir1> <dir2>";
    exit -1;
fi;

dir1=$1
dir2=$2

oldcolor='\033[1;31m';
newcolor='\033[1;32m';
nocolor='\033[0m';

IFS=$'\n'
echo '--------------------------';
for line in `diff --brief -r $dir1 $dir2`; do
    if [[ $line == *"differ" ]]; then
        firstfile=`echo $line | awk '{print $2}'`;
        secondfile=`echo $line | awk '{print $4}'`;
        if [ $firstfile -ot $secondfile ]; then
            echo -n "Files "
            echo -ne ${oldcolor}$firstfile${nocolor} and ${newcolor}$secondfile${nocolor};
            echo " differ"
        else
            echo -n "Files "
            echo -ne ${newcolor}$firstfile${nocolor} and ${oldcolor}$secondfile${nocolor};
            echo " differ"
        fi
    else
        echo $line;
    fi
done;
echo '--------------------------';