ctime.pl用来做什么的？

zw2002

我发现在程序有require "ctime.pl";
但是在这个目录下没有这个文件，从网上down了一个，好象不对？

1. 
   
2. ;# ctime.pl is a simple Perl emulation for the well known ctime(3C) function.
   
3. #
   
4. # This library is no longer being maintained, and is included for backward
   
5. # compatibility with Perl 4 programs which may require it.
   
6. #
   
7. # In particular, this should not be used as an example of modern Perl
   
8. # programming techniques.
   
9. #
   
10. # Suggested alternative: the POSIX ctime function
    
11. ;#
    
12. ;# Waldemar Kebsch, Federal Republic of Germany, November 1988
    
13. ;# kebsch.pad@nixpbe.UUCP
    
14. ;# Modified March 1990, Feb 1991 to properly handle timezones
    
15. ;#  $RCSfile: ctime.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:23:47 $
    
16. ;#   Marion Hakanson (hakanson@cse.ogi.edu)
    
17. ;#   Oregon Graduate Institute of Science and Technology
    
18. ;#
    
19. ;# usage:
    
20. ;#
    
21. ;#     #include <ctime.pl>          # see the -P and -I option in perl.man
    
22. ;#     $Date = &ctime(time);
    
23. 
    
24. CONFIG: {
    
25.     package ctime;
    
26. 
    
27.     @DoW = ('Sun','Mon','Tue','Wed','Thu','Fri','Sat');
    
28.     @MoY = ('Jan','Feb','Mar','Apr','May','Jun',
    
29.             'Jul','Aug','Sep','Oct','Nov','Dec');
    
30. }
    
31. 
    
32. sub ctime {
    
33.     package ctime;
    
34. 
    
35.     local($time) = @_;
    
36.     local($[) = 0;
    
37.     local($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);
    
38. 
    
39.     # Determine what time zone is in effect.
    
40.     # Use GMT if TZ is defined as null, local time if TZ undefined.
    
41.     # There's no portable way to find the system default timezone.
    
42. 
    
43.     $TZ = defined($ENV{'TZ'}) ? ( $ENV{'TZ'} ? $ENV{'TZ'} : 'GMT' ) : '';
    
44.     ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
    
45.         ($TZ eq 'GMT') ? gmtime($time) : localtime($time);
    
46. 
    
47.     # Hack to deal with 'PST8PDT' format of TZ
    
48.     # Note that this can't deal with all the esoteric forms, but it
    
49.     # does recognize the most common: [:]STDoff[DST[off][,rule]]
    
50. 
    
51.     if($TZ=~/^([^:\d+\-,]{3,})([+-]?\d{1,2}(:\d{1,2}){0,2})([^\d+\-,]{3,})?/){
    
52.         $TZ = $isdst ? $4 : $1;
    
53.     }
    
54.     $TZ .= ' ' unless $TZ eq '';
    
55. 
    
56.     $year += 1900;
    
57.     sprintf("%s %s %2d %2d:%02d:%02d %s%4d\n",
    
58.       $DoW[$wday], $MoY[$mon], $mday, $hour, $min, $sec, $TZ, $year);
    
59. }
    
60. 1;
    
61. 
    

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zw2002

系统是redhat

zw2002

在系统的目录下找到这个文件了，是一样的。
/usr/lib/perl5/5.8.0/ctime.pl