Time-specific find

find.sh

#!/bin/bash

USAGE="Usage: $0 <FOLDER> <ORIGIN-FILE> <TIME-LIMIT> [RECURSIVE?]"

if [ -z $1 ] || [ -z $2 ] || [ -z $3 ]; then
        echo $USAGE
        exit 1
fi

DIR=$1
ORG="$(date --date "$(stat $2 | grep -E 'Modify: (.*)$' | grep -oE '[0-9]+.*')" +"%s")"
LIM=$3
REC=""

if [ -z $4 ]; then
        REC="-maxdepth 1"
fi

if [ ! -d $DIR ]; then
        echo "Error: directory '$DIR' doesn't exist"
fi

echo "Origin: $ORG"

for item in $(find $DIR $REC); do
        FILE=$item
        TIMESTAMP="$(date --date "$(stat $FILE | grep -E 'Modify: (.*)$' | grep -oE '[0-9]+.*')" +"%s")"
        if [ $LIM -gt 0 ]; then
                CHECK=$(($ORG + $LIM))
                if [ $TIMESTAMP -lt $CHECK ] && [ $TIMESTAMP -gt $ORG ]; then
                        echo $FILE
                fi
        fi
        if [ $LIM -lt 0 ]; then
                CHECK=$(($ORG $LIM))
                if [ $TIMESTAMP -gt $CHECK ] && [ $TIMESTAMP -lt $ORG ]; then
                        echo $FILE
                fi
        fi
done