Full Discussion: mtime vs ctime
Top Forums UNIX for Dummies Questions & Answers mtime vs ctime Post 57473 by moxxx68 on Friday 29th of October 2004 01:32:32 AM
Bug mtime vs ctime

Smilie i have a slight problem and would appreciate if someone could clarify the confusion.. i use find alot and so far i have done ok.. but it just struck me a couple of days ago that I am not quite sure what the difference between the modification time and the change time as in ctime and mtime and especially cnewer and newer.. as far as I can see I have tried to stat some of my files and most of the time all three access change and modification are the same.. no clues as to the differences from the man pages... which talks about modifcation and change isn't that the same.
any examples clues or feedback welcome
thanx moxx68Smilie
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Touch(3pm)						User Contributed Perl Documentation						Touch(3pm)

File::Touch - update access and modification timestamps, creating nonexistent files where necessary. SYNOPSIS
use File::Touch; @file_list = ('one.txt','../two.doc'); $count = touch(@file_list); use File::Touch; $reference_file = '/etc/passwd'; $touch_obj = File::Touch->new( reference => $reference_file, no_create => 1 ); @file_list = ('one.txt','../two.doc'); $count = $touch_obj->touch(@file_list); DESCRIPTION
Here's a list of arguments that can be used with the object-oriented contruction: atime_only => [0|1] If nonzero, change only the access time of files. Default is zero. mtime_only => [0|1] If nonzero, change only the modification time of files. Default is zero. no_create => [0|1] If nonzero, do not create new files. Default is zero. reference => $reference_file If defined, use timestamps from this file instead of current time. Default is undefined. atime => $time If defined, use this time (in epoch seconds) instead of current time for access time. mtime => $time If defined, use this time (in epoch seconds) instead of current time for modification time. Examples Update access and modification times, creating nonexistent files use File::Touch; my @files = ('one','two','three'); my $count = touch(@files); print "$count files updated "; Set access time forward, leave modification time unchanged use File::Touch; my @files = ('one','two','three'); my $day = 24*60*60; my $time = time() + 30 * $day; my $ref = File::Touch->new( atime_only => 1, time => $time ); my $count = $ref->touch(@files); print "$count files updated "; Set modification time back, update access time, do not create nonexistent files use File::Touch; my @files = ('one','two','three'); my $day = 24*60*60; my $time = time() - 30 * $day; my $ref = File::Touch->new( mtime => $time, no_create => 1 ); my $count = $ref->touch(@files); print "$count files updated "; AUTHOR
Nigel Wetters Gourlay (nwetters@cpan.org) COPYRIGHT
Copyright (c) 2001,2007,2009 Nigel Wetters Gourlay. All Rights Reserved. This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself. perl v5.10.0 2009-07-25 Touch(3pm)

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