UNIX for Advanced & Expert Users

#!/bin/sh

#----subtract 10 minutes (600 seconds) from time
STAMP=$(perl -e '($ss, $mm, $hh, $DD, $MM, $YY) = localtime(time() - 600);
printf "%04d%02d%02d%02d%02d", $YY + 1900, $MM + 1, $DD, $hh, $mm')

#----create an empty file with a timestamp of 10 minutes ago
touch -t $STAMP /tmp/flagfile

#----find older files
find /start/dir -type f ! -newer /tmp/flagfile -print |\
while read FILE
do
  : something with $FILE
done