Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!axion!vision!chris
From: chris@vision.UUCP (Chris Davies)
Newsgroups: comp.unix.questions
Subject: Re: how to compare file modification time in bourne shell script
Message-ID: <1147@vision.UUCP>
Date: 26 Jul 90 16:06:00 GMT
References: <1990Jul23.233044.2729@silma.com>
Reply-To: chris@vision.UUCP (Chris Davies)
Organization: VisionWare Ltd., Leeds, UK
Lines: 34

In article <1990Jul23.233044.2729@silma.com> aab@silma.UUCP () writes:
>I need to compare the modification times of two files in a bourne shell
>script. I would like to do this without writing C code.

If you insist...  :-)

The function returns 0 if file1 is newer than file2.  Otherwise it returns 1.
Note that there is no check to ensure both files exist.
Syntax: newer file1 file2

newer() {
	F1=$1
	F2=$2

	echo "$F1\n$F2" > /tmp/newer$$
	if ls -t "$F1" "$F2" | cmp -s - /tmp/newer$$
	then
		RS=0
	else
		RS=1
	fi

	rm -f /tmp/newer$$
	return $RS
}

Have fun...
		Chris
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