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Network computer devices that originate, route and terminate the data are called server-only devices.
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file::listing(3) [redhat man page]

File::Listing(3)					User Contributed Perl Documentation					  File::Listing(3)

NAME
parse_dir - parse directory listing SYNOPSIS
use File::Listing; for (parse_dir(`ls -l`)) { ($name, $type, $size, $mtime, $mode) = @$_; next if $type ne 'f'; # plain file #... } # directory listing can also be read from a file open(LISTING, "zcat ls-lR.gz|"); $dir = parse_dir(*LISTING, '+0000'); DESCRIPTION
The parse_dir() routine can be used to parse directory listings. Currently it only understand Unix 'ls -l' and 'ls -lR' format. It should eventually be able to most things you might get back from a ftp server file listing (LIST command), i.e. VMS listings, NT listings, DOS listings,... The first parameter to parse_dir() is the directory listing to parse. It can be a scalar, a reference to an array of directory lines or a glob representing a filehandle to read the directory listing from. The second parameter is the time zone to use when parsing time stamps in the listing. If this value is undefined, then the local time zone is assumed. The third parameter is the type of listing to assume. The values will be strings like 'unix', 'vms', 'dos'. Currently only 'unix' is implemented and this is also the default value. Ideally, the listing type should be determined automatically. The fourth parameter specifies how unparseable lines should be treated. Values can be 'ignore', 'warn' or a code reference. Warn means that the perl warn() function will be called. If a code reference is passed, then this routine will be called and the return value from it will be incorporated in the listing. The default is 'ignore'. Only the first parameter is mandatory. The return value from parse_dir() is a list of directory entries. In a scalar context the return value is a reference to the list. The directory entries are represented by an array consisting of [ $filename, $filetype, $filesize, $filetime, $filemode ]. The $filetype value is one of the letters 'f', 'd', 'l' or '?'. The $filetime value is the seconds since Jan 1, 1970. The $filemode is a bitmask like the mode returned by stat(). CREDITS
Based on lsparse.pl (from Lee McLoughlin's ftp mirror package) and Net::FTP's parse_dir (Graham Barr). libwww-perl-5.65 1999-03-20 File::Listing(3)

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DirCompare(3pm) 					User Contributed Perl Documentation					   DirCompare(3pm)

NAME
File::DirCompare - Perl module to compare two directories using callbacks. SYNOPSIS
use File::DirCompare; # Simple diff -r --brief replacement use File::Basename; File::DirCompare->compare($dir1, $dir2, sub { my ($a, $b) = @_; if (! $b) { printf "Only in %s: %s ", dirname($a), basename($a); } elsif (! $a) { printf "Only in %s: %s ", dirname($b), basename($b); } else { print "Files $a and $b differ "; } }); # Version-control like Deleted/Added/Modified listing my (@listing, @modified); # use closure to collect results File::DirCompare->compare('old_tree', 'new_tree', sub { my ($a, $b) = @_; if (! $b) { push @listing, "D $a"; } elsif (! $a) { push @listing, "A $b"; } else { if (-f $a && -f $b) { push @listing, "M $b"; push @modified, $b; } else { # One file, one directory - treat as delete + add push @listing, "D $a"; push @listing, "A $b"; } } }); DESCRIPTION
File::DirCompare is a perl module to compare two directories using a callback, invoked for all files that are 'different' between the two directories, and for any files that exist only in one or other directory ('unique' files). File::DirCompare has a single public compare() method, with the following signature: File::DirCompare->compare($dir1, $dir2, $sub, $opts); The first three arguments are required - $dir1 and $dir2 are paths to the two directories to be compared, and $sub is the subroutine reference called for all unique or different files. $opts is an optional hashref of options - see OPTIONS below. The provided subroutine is called for all unique files, and for every pair of 'different' files encountered, with the following signature: $sub->($file1, $file2) where $file1 and $file2 are the paths to the two files. For 'unique' files i.e. where a file exists in only one directory, the subroutine is called with the other argument 'undef' i.e. for: $sub->($file1, undef) $sub->(undef, $file2) the first indicates $file1 exists only in the first directory given ($dir1), and the second indicates $file2 exists only in the second directory given ($dir2). OPTIONS The following optional arguments are supported, passed in using a hash reference after the three required arguments to compare() e.g. File::DirCompare->compare($dir1, $dir2, $sub, { cmp => $cmp_sub, ignore_unique => 1, }); cmp By default, two files are regarded as different if their contents do not match (tested with File::Compare::compare). That default behaviour can be overridden by providing a 'cmp' subroutine to do the file comparison, returning zero if the two files are equal, and non-zero if not. E.g. to compare using modification times instead of file contents: File::DirCompare->compare($dir1, $dir2, $sub, { cmp => sub { -M $_[0] <=> -M $_[1] }, }); ignore_cmp If you want to see all corresponding files, not just 'different' ones, set the 'ignore_cmp' flag to tell File::DirCompare to skip its file comparison checks i.e. File::DirCompare->compare($dir1, $dir2, $sub, { ignore_cmp => 1 }); ignore_unique If you want to ignore files that only exist in one of the two directories, set the 'ignore_unique' flag i.e. File::DirCompare->compare($dir1, $dir2, $sub, { ignore_unique => 1 }); SEE ALSO
File::Dircmp, which provides similar functionality (and whose directory walking code I've adapted for this module), but a simpler reporting-only interface, something like the first example in the SYNOPSIS above. AUTHOR AND CREDITS
Gavin Carr <gavin@openfusion.com.au> Thanks to Robin Barker for a bug report and fix for glob problems with whitespace. COPYRIGHT AND LICENSE
Copyright 2006-2007 by Gavin Carr. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-03-02 DirCompare(3pm)

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