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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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Time::localtime(3pm)					 Perl Programmers Reference Guide				      Time::localtime(3pm)

NAME
Time::localtime - by-name interface to Perl's built-in localtime() function SYNOPSIS
use Time::localtime; printf "Year is %d ", localtime->year() + 1900; $now = ctime(); use Time::localtime; use File::stat; $date_string = ctime(stat($file)->mtime); DESCRIPTION
This module's default exports override the core localtime() function, replacing it with a version that returns "Time::tm" objects. This object has methods that return the similarly named structure field name from the C's tm structure from time.h; namely sec, min, hour, mday, mon, year, wday, yday, and isdst. You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding "tm_" in front their method names. Thus, "$tm_obj->mday()" corresponds to $tm_mday if you import the fields. The ctime() function provides a way of getting at the scalar sense of the original CORE::localtime() function. To access this functionality without the core overrides, pass the "use" an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the "CORE::" pseudo-package. NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this. AUTHOR
Tom Christiansen perl v5.16.3 2013-02-26 Time::localtime(3pm)
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