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Shell Programming and Scripting
Formatting output
Post 302765755 by Daniel Gate on Sunday 3rd of February 2013 09:28:40 AM
02-03-2013
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LEARN ABOUT DEBIAN
path::class::file::stat
Path::Class::File::Stat(3pm) User Contributed Perl Documentation Path::Class::File::Stat(3pm) NAME
Path::Class::File::Stat - cache and compare stat() calls on a Path::Class::File object SYNOPSIS
use Path::Class::File::Stat; my $file = Path::Class::File::Stat->new('path','to','file'); # $file has all the magic of Path::Class::File # sometime later if ($file->changed) { # do something provocative } DESCRIPTION
Path::Class::File::Stat is a simple extension of Path::Class::File. Path::Class::File::Stat is useful in long-running programs (as under mod_perl) where you might have a file handle opened and want to check if the underlying file has changed. METHODS
Path::Class::File::Stat extends Path::Class::File objects in the following ways. use_md5 Calling this method will attempt to load Digest::MD5 and use that instead of stat() for creating file signatures. This is similar to how File::Modified works. changed Returns the previously cached File::stat object if the file's device number and inode number have changed, or if the modification time or size has changed. Returns 0 (false) otherwise. While File::Modified uses a MD5 signature of the stat() of a file to determine if the file has changed, changed() uses a simpler (and probably more naive) algorithm. If you need a more sophisticated way of determining if a file has changed, use the restat() method and compare the cached File::stat object it returns with the current File::stat object. Example of your own changed() logic: my $oldstat = $file->restat; my $newstat = $file->stat; # compare $oldstat and $newstat any way you like Or just use File::Modified instead. restat Re-cache the File::stat object in the Path::Class::File::Stat object. Returns the previously cached File::stat object. The changed() method calls this method internally if changed() is going to return true. SEE ALSO
Path::Class, Path::Class::File, File::Signature, File::Modified AUTHOR
Peter Karman, <karman@cpan.org> COPYRIGHT AND LICENSE
Copyright (C) 2006 by Peter Karman This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-01-28 Path::Class::File::Stat(3pm)