#!/bin/bash

# Scripts checks whether 'testfile' has been modified and prints result

# File 'last_change' contains last saved modification date-time of 'testfile'
# and gets updated if 'stat testfile' shows a different modification date

# stdin stdout stderr

DIR=`dirname $0` > /dev/null
pushd $DIR > /dev/null

# file 'testfile' not a regular file? exit with error
if [ ! -f testfile ]
then
   echo "Datei nicht gefunden"
   echo "Ende mit Fehlercode 1"
   popd > /dev/null
   exit 1
fi

# File 'testfile' found
# get 'testfile' modified date-time
modified=`stat testfile | grep -i modi | awk -F' ' '{ print $2 " " $3 }'`

# get date-time from change before
last_modified=`cat last_change`
# ` Backtick

# if both date-time equal no change!
if [ "$modified" == "$last_modified" ]
then
   echo "Datei nicht modifiziert!"
else
   # not equal: file changed
   echo "Datei modifiziert!"
   # save last modified
   echo "$modified" > last_change
fi

popd > /dev/null
exit 0