FAQ 5.27 How do I set a file's timestamp in perl?
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From: PerlFAQ Server on 8 Jul 2010 12:00 This is an excerpt from the latest version perlfaq5.pod, which comes with the standard Perl distribution. These postings aim to reduce the number of repeated questions as well as allow the community to review and update the answers. The latest version of the complete perlfaq is at http://faq.perl.org . -------------------------------------------------------------------- 5.27: How do I set a file's timestamp in perl? You use the utime() function documented in "utime" in perlfunc. By way of example, here's a little program that copies the read and write times from its first argument to all the rest of them. if (@ARGV < 2) { die "usage: cptimes timestamp_file other_files ...\n"; } my $timestamp = shift; my($atime, $mtime) = (stat($timestamp))[8,9]; utime $atime, $mtime, @ARGV; Error checking is, as usual, left as an exercise for the reader. The perldoc for utime also has an example that has the same effect as touch(1) on files that *already exist*. Certain file systems have a limited ability to store the times on a file at the expected level of precision. For example, the FAT and HPFS filesystem are unable to create dates on files with a finer granularity than two seconds. This is a limitation of the filesystems, not of utime(). -------------------------------------------------------------------- The perlfaq-workers, a group of volunteers, maintain the perlfaq. They are not necessarily experts in every domain where Perl might show up, so please include as much information as possible and relevant in any corrections. The perlfaq-workers also don't have access to every operating system or platform, so please include relevant details for corrections to examples that do not work on particular platforms. Working code is greatly appreciated. If you'd like to help maintain the perlfaq, see the details in perlfaq.pod. |