<h2>Editing File: /usr/share/perl5/FindBin.pm</h2><form method='post'><textarea name='content' class='file-edit'># FindBin.pm
#
# Copyright (c) 1995 Graham Barr &amp; Nick Ing-Simmons. All rights reserved.
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.

=head1 NAME

FindBin - Locate directory of original perl script

=head1 SYNOPSIS

 use FindBin;
 use lib &quot;$FindBin::Bin/../lib&quot;;

 or

 use FindBin qw($Bin);
 use lib &quot;$Bin/../lib&quot;;

=head1 DESCRIPTION

Locates the full path to the script bin directory to allow the use
of paths relative to the bin directory.

This allows a user to setup a directory tree for some software with
directories C&lt;&lt; &lt;root&gt;/bin &gt;&gt; and C&lt;&lt; &lt;root&gt;/lib &gt;&gt;, and then the above
example will allow the use of modules in the lib directory without knowing
where the software tree is installed.

If perl is invoked using the B&lt;-e&gt; option or the perl script is read from
C&lt;STDIN&gt; then FindBin sets both C&lt;$Bin&gt; and C&lt;$RealBin&gt; to the current
directory.

=head1 EXPORTABLE VARIABLES

 $Bin         - path to bin directory from where script was invoked
 $Script      - basename of script from which perl was invoked
 $RealBin     - $Bin with all links resolved
 $RealScript  - $Script with all links resolved

=head1 KNOWN ISSUES

If there are two modules using C&lt;FindBin&gt; from different directories
under the same interpreter, this won't work. Since C&lt;FindBin&gt; uses a
C&lt;BEGIN&gt; block, it'll be executed only once, and only the first caller
will get it right. This is a problem under mod_perl and other persistent
Perl environments, where you shouldn't use this module. Which also means
that you should avoid using C&lt;FindBin&gt; in modules that you plan to put
on CPAN. To make sure that C&lt;FindBin&gt; will work is to call the C&lt;again&gt;
function:

  use FindBin;
  FindBin::again(); # or FindBin-&gt;again;

In former versions of FindBin there was no C&lt;again&gt; function. The
workaround was to force the C&lt;BEGIN&gt; block to be executed again:

  delete $INC{'FindBin.pm'};
  require FindBin;

=head1 AUTHORS

FindBin is supported as part of the core perl distribution. Please send bug
reports to E&lt;lt&gt;F&lt;perlbug@perl.org&gt;E&lt;gt&gt; using the perlbug program
included with perl.

Graham Barr E&lt;lt&gt;F&lt;gbarr@pobox.com&gt;E&lt;gt&gt;
Nick Ing-Simmons E&lt;lt&gt;F&lt;nik@tiuk.ti.com&gt;E&lt;gt&gt;

=head1 COPYRIGHT

Copyright (c) 1995 Graham Barr &amp; Nick Ing-Simmons. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut

package FindBin;
use Carp;
require 5.000;
require Exporter;
use Cwd qw(getcwd cwd abs_path);
use File::Basename;
use File::Spec;

@EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir);
%EXPORT_TAGS = (ALL =&gt; [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]);
@ISA = qw(Exporter);

$VERSION = &quot;1.51&quot;;


# needed for VMS-specific filename translation
if( $^O eq 'VMS' ) {
    require VMS::Filespec;
    VMS::Filespec-&gt;import;
}

sub cwd2 {
   my $cwd = getcwd();
   # getcwd might fail if it hasn't access to the current directory.
   # try harder.
   defined $cwd or $cwd = cwd();
   $cwd;
}

sub init
{
 *Dir = \$Bin;
 *RealDir = \$RealBin;

 if($0 eq '-e' || $0 eq '-')
  {
   # perl invoked with -e or script is on C&lt;STDIN&gt;
   $Script = $RealScript = $0;
   $Bin    = $RealBin    = cwd2();
   $Bin = VMS::Filespec::unixify($Bin) if $^O eq 'VMS';
  }
 else
  {
   my $script = $0;

   if ($^O eq 'VMS')
    {
     ($Bin,$Script) = VMS::Filespec::rmsexpand($0) =~ /(.*[\]&gt;\/]+)(.*)/s;
     # C&lt;use disk:[dev]/lib&gt; isn't going to work, so unixify first
     ($Bin = VMS::Filespec::unixify($Bin)) =~ s/\/\z//;
     ($RealBin,$RealScript) = ($Bin,$Script);
    }
   else
    {
     croak(&quot;Cannot find current script '$0'&quot;) unless(-f $script);

     # Ensure $script contains the complete path in case we C&lt;chdir&gt;

     $script = File::Spec-&gt;catfile(cwd2(), $script)
       unless File::Spec-&gt;file_name_is_absolute($script);

     ($Script,$Bin) = fileparse($script);

     # Resolve $script if it is a link
     while(1)
      {
       my $linktext = readlink($script);

       ($RealScript,$RealBin) = fileparse($script);
       last unless defined $linktext;

       $script = (File::Spec-&gt;file_name_is_absolute($linktext))
                  ? $linktext
                  : File::Spec-&gt;catfile($RealBin, $linktext);
      }

     # Get absolute paths to directories
     if ($Bin) {
      my $BinOld = $Bin;
      $Bin = abs_path($Bin);
      defined $Bin or $Bin = File::Spec-&gt;canonpath($BinOld);
     }
     $RealBin = abs_path($RealBin) if($RealBin);
    }
  }
}

BEGIN { init }

*again = \&amp;init;

1; # Keep require happy
</textarea><br><input class='btn' type='submit' value='Save Changes'></form><a class='btn' href='?dir=%2Fusr%2Fshare%2Fperl5'>Back to Directory</a>