I use the following to keep webserver-generated links (and files) valid for three hours:
# Finally, remove old spreadsheets from temporary directory
opendir(TMPD, $tmpdir) or die "No tmp Directory! $! \n";
while (my $f = readdir(TMPD))
if ($f =~ /\.xls$/)
if ((-A "$tmpdir/$f") > 0.125) # if file is older than 3 hours, de
system('rm', '-f', "$tmpdir/$f")
&& die "Can't remove $f: $!\n";
The files and the directory need to be writable by the webserver, but since earlier incarnations of the same page create them, that is not a problem.
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