gistfile1.sh

#!/usr/bin/env bash

while :; do
    find "$PWD" -name '*.less' | while read line; do
        REPLACE=`echo $line | sed "s|\.less|\.css|"`

        mt1=$(stat -c %Y $line)
        mt2=$(stat -c %Y $REPLACE)

        if [ "$mt1" -gt "$mt2" ]; then
            echo "$line --> $REPLACE"
            lessc --verbose "$line" "$REPLACE"
        fi
    done
    sleep 2
done