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Date:      Wed, 27 Dec 2006 18:53:17 +0300
From:      Odhiambo Washington <wash@wananchi.com>
To:        freebsd-questions@freebsd.org
Subject:   Calculate the time of last modification of a file
Message-ID:  <20061227155317.GC95520@ns2.wananchi.com>

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Hiya,

I hope you had a merry Christmas ;)

I am trying to determine the time of last modification of a file,
on FreeBSD.

The following code achieves the same on Linux:


# AGE = (current time) - (time of last modification of "$FILE")
# please check your systems 'stat' command!
AGE=$(($(date +%s) - $(stat -c '%Y' "$FILE")))

test $AGE -lt $DELAY && {
        echo -n yes
        exit 0
}


Here is the whole bash script, just so that everything is clear:

<cut>

#!/usr/local/bin/bash
test -t 0 && trap "echo" EXIT

NAME="$1"; shift
DELAY="${1:-600}"; shift
BASE="${1:-/var/run/greydata}"; shift

NAME=${NAME//.//}
DIR=$BASE/${NAME%/*}
FILE=$DIR/${NAME##*/}


test -d "$DIR" || mkdir -p "$DIR"

test -f "$FILE" || {
	> "$FILE"
	echo -n yes
	exit 0 
}

# AGE = (current time) - (time of last modification of "$FILE")
# please check your systems 'stat' command!
AGE=$(($(date +%s) - $(stat -c '%Y' "$FILE")))

test $AGE -lt $DELAY && {
	echo -n yes
	exit 0
}

read <"$FILE"
echo -n no
exit 0

</cut>


The `stat -c` is illegal for FreeBSD. However I don't seem to understand 
clearly what the man page for stat is telling me, to enable me make this
work.






-Wash

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