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Full Discussion: du alternative in perl
Top Forums Shell Programming and Scripting du alternative in perl Post 302233882 by jim mcnamara on Monday 8th of September 2008 05:31:30 PM
Old 09-08-2008
du depends heavily on stat - which is POSIX. So writing C code is failry portable,
along with the dirent.h functions

perl implements stat, so that's cake. The other needed calls: closedir, opendir, and readdir to get file names to stat. Both of those are in perl as well.... go for it.

Perl by Example has an example getting all the file names in a directory.

This does something else with stat data as entry-level example code for the forums here, but you can clean it up for your use:

Code:
#!/usr/bin/perl 
    use strict;
	sub numeric;
	sub to_date;
	my @filelist = ();
	my @sortarray = ();
	my $idx = 0;
	my $value = "";
	my $file = "";
	opendir(DIR, "..") || die "can't open $!\n";
	@filelist = readdir(DIR);
	closedir(DIR);

	$idx = 0;
	@sortarray = ();
	foreach $file ( @filelist )
	{
		$sortarray[$idx] = sprintf("%d %s", (stat "../$file")[9], $file);
		$idx++;
	}

	@filelist = sort numeric @sortarray ;
    print "@filelist\n";
	foreach $value ( @filelist )
	{
		print &to_date( $value );
	}

	sub numeric { my @one = split(' ', $a);
		          my @two = split(' ', $b); 
		          return $one[0] <=> $two[0];
		        }
	sub to_date {
		 my @months = ();
		 my $filename = "";
		 my $mtime = 0;
		 my $sec = 0; 
		 my $min = 0; 
		 my $hr = 0;
		 my $mday = 0; 
		 my $mon = 0; 
		 my $yr = 0; 
		 my $wday = 0; 
		 my $yday = 0; 
		 my $dntcare =0;
		 my $retval = "";
		 
		 @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);

         ($mtime, $filename) = split(' ', $_[0]);	     
	     ($sec, $min, $hr, $mday, $mon, $yr, $wday, $yday, $dntcare) =
	         localtime($mtime);
	     $retval = sprintf( "%-10s %3s %02d %4d %02d:%02d:%02d\n",
	         $filename, $months[$mon], $mday, $yr + 1900, $hr, $min, $sec );

         return $retval;
	}

 

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LEARN ABOUT DEBIAN

posix::strptime

POSIX::strptime(3pm)					User Contributed Perl Documentation				      POSIX::strptime(3pm)

NAME

       POSIX::strptime - Perl extension to the POSIX date parsing strptime(3) function

SYNOPSIS

	($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = POSIX::strptime("string", "Format");

DESCRIPTION

       Perl interface to strptime(3)

FUNCTIONS

       strptime
	    ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = POSIX::strptime(string, format);

	   The result for any value not extracted is not defined. Some platforms may reliably return "undef", but this is dependent on the
	   strptime(3) function in the underlying C library.

	   For example, only the following fields may be relied upon:

	    my ($min, $hour) = ( POSIX::strptime( "01:23", '%H:%M' ) )[1,2];

	    my ($mday, $mon, $year) = ( POSIX::strptime( "2010/07/16", '%Y/%m/%d' ) )[3,4,5];

	   Furthermore, not all platforms will set the $wday and $yday elements. If these values are required, use "mktime" and "gmtime":

	    use POSIX qw( mktime );
	    use POSIX::strptime qw( strptime );

	    my ($mday, $mon, $year) = ( POSIX::strptime( "2010/07/16", '%Y/%m/%d' ) )[3,4,5];
	    my $wday = ( gmtime mktime 0, 0, 0, $mday, $mon, $year )[6];

SEE ALSO

       strptime(3)

AUTHOR

       Philippe M. Chiasson <gozer@cpan.org> Kim Scheibel <kim@scheibel.co.uk>

REPOSITORY

       http://svn.ectoplasm.org/projects/perl/POSIX-strptime/trunk/

COPYRIGHT

       Copyright 2005 by Philippe M. Chiasson <gozer@cpan.org>.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       See http://www.perl.com/perl/misc/Artistic.html

perl v5.14.2							    2010-07-16						      POSIX::strptime(3pm)
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