# Copyright (c) 1995 Graham Barr & 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.
FindBin - Locate directory of original perl script
use lib "$FindBin::Bin/../lib";
Locates the full path to the script bin directory to allow the use
of paths relative to the bin directory.
This allows a user to setup a directory tree for some software with
directories C<< <root>/bin >> and C<< <root>/lib >>, and then the above
example will allow the use of modules in the lib directory without knowing
where the software tree is installed.
If perl is invoked using the B<-e> option or the perl script is read from
C<STDIN> then FindBin sets both C<$Bin> and C<$RealBin> to the current
=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
If there are two modules using C<FindBin> from different directories
under the same interpreter, this won't work. Since C<FindBin> uses a
C<BEGIN> 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<FindBin> in modules that you plan to put
on CPAN. To make sure that C<FindBin> will work is to call the C<again>
FindBin::again(); # or FindBin->again;
In former versions of FindBin there was no C<again> function. The
workaround was to force the C<BEGIN> block to be executed again:
delete $INC{'FindBin.pm'};
and I<filename> does not have executable rights and a program called
I<filename> exists in the users C<$ENV{PATH}> which satisfies both B<-x>
and B<-T> then FindBin assumes that it was invoked via the
Workaround is to invoke perl as
FindBin is supported as part of the core perl distribution. Please send bug
reports to E<lt>F<perlbug@perl.org>E<gt> using the perlbug program
Graham Barr E<lt>F<gbarr@pobox.com>E<gt>
Nick Ing-Simmons E<lt>F<nik@tiuk.ti.com>E<gt>
Copyright (c) 1995 Graham Barr & 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.
use Cwd
qw(getcwd cwd abs_path);
@EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir);
%EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]);
# getcwd might fail if it hasn't access to the current directory.
defined $cwd or $cwd = cwd
();
if($0 eq '-e' || $0 eq '-')
# perl invoked with -e or script is on C<STDIN>
$Script = $RealScript = $0;
$Bin = $RealBin = cwd2
();
($Bin,$Script) = VMS
::Filespec
::rmsexpand
($0) =~ /(.*\])(.*)/s;
($RealBin,$RealScript) = ($Bin,$Script);
my $dosish = ($^O
eq 'MSWin32' or $^O
eq 'os2');
unless(($script =~ m
#/# || ($dosish && $script =~ m#\\#))
foreach $dir (File
::Spec
->path)
my $scr = File
::Spec
->catfile($dir, $script);
if(-r
$scr && (!$dosish || -x _
))
# $script has been found via PATH but perl could have
# been invoked as 'perl file'. Do a dumb check to see
# if $script is a perl program, if not then $script = $0
# well we actually only check that it is an ASCII file
# we know its executable so it is probably a script
$script = $0 unless(-T
$script);
croak
("Cannot find current script '$0'") unless(-f
$script);
# Ensure $script contains the complete path in case we C<chdir>
$script = File
::Spec
->catfile(cwd2
(), $script)
unless File
::Spec
->file_name_is_absolute($script);
($Script,$Bin) = fileparse
($script);
# Resolve $script if it is a link
my $linktext = readlink($script);
($RealScript,$RealBin) = fileparse
($script);
last unless defined $linktext;
$script = (File
::Spec
->file_name_is_absolute($linktext))
: File
::Spec
->catfile($RealBin, $linktext);
# Get absolute paths to directories
defined $Bin or $Bin = File
::Spec
->canonpath($BinOld);
$RealBin = abs_path
($RealBin) if($RealBin);