3 # Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved.
4 # This program is free software; you can redistribute it and/or modify it
5 # under the same terms as Perl itself.
9 FindBin - Locate directory of original perl script
14 use lib "$FindBin::Bin/../lib";
19 use lib "$Bin/../lib";
23 Locates the full path to the script bin directory to allow the use
24 of paths relative to the bin directory.
26 This allows a user to setup a directory tree for some software with
27 directories C<< <root>/bin >> and C<< <root>/lib >>, and then the above
28 example will allow the use of modules in the lib directory without knowing
29 where the software tree is installed.
31 If perl is invoked using the B<-e> option or the perl script is read from
32 C<STDIN> then FindBin sets both C<$Bin> and C<$RealBin> to the current
35 =head1 EXPORTABLE VARIABLES
37 $Bin - path to bin directory from where script was invoked
38 $Script - basename of script from which perl was invoked
39 $RealBin - $Bin with all links resolved
40 $RealScript - $Script with all links resolved
44 If there are two modules using C<FindBin> from different directories
45 under the same interpreter, this won't work. Since C<FindBin> uses a
46 C<BEGIN> block, it'll be executed only once, and only the first caller
47 will get it right. This is a problem under mod_perl and other persistent
48 Perl environments, where you shouldn't use this module. Which also means
49 that you should avoid using C<FindBin> in modules that you plan to put
50 on CPAN. To make sure that C<FindBin> will work is to call the C<again>
54 FindBin::again(); # or FindBin->again;
56 In former versions of FindBin there was no C<again> function. The
57 workaround was to force the C<BEGIN> block to be executed again:
59 delete $INC{'FindBin.pm'};
64 FindBin is supported as part of the core perl distribution. Please send bug
65 reports to E<lt>F<perlbug@perl.org>E<gt> using the perlbug program
68 Graham Barr E<lt>F<gbarr@pobox.com>E<gt>
69 Nick Ing-Simmons E<lt>F<nik@tiuk.ti.com>E<gt>
73 Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved.
74 This program is free software; you can redistribute it and/or modify it
75 under the same terms as Perl itself.
83 use Cwd qw(getcwd cwd abs_path);
87 @EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir);
88 %EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]);
94 # needed for VMS-specific filename translation
96 require VMS::Filespec;
97 VMS::Filespec->import;
102 # getcwd might fail if it hasn't access to the current directory.
104 defined $cwd or $cwd = cwd();
111 *RealDir = \$RealBin;
113 if($0 eq '-e' || $0 eq '-')
115 # perl invoked with -e or script is on C<STDIN>
116 $Script = $RealScript = $0;
117 $Bin = $RealBin = cwd2();
118 $Bin = VMS::Filespec::unixify($Bin) if $^O eq 'VMS';
126 ($Bin,$Script) = VMS::Filespec::rmsexpand($0) =~ /(.*[\]>\/]+)(.*)/s;
127 # C<use disk:[dev]/lib> isn't going to work, so unixify first
128 ($Bin = VMS::Filespec::unixify($Bin)) =~ s/\/\z//;
129 ($RealBin,$RealScript) = ($Bin,$Script);
133 croak("Cannot find current script '$0'") unless(-f $script);
135 # Ensure $script contains the complete path in case we C<chdir>
137 $script = File::Spec->catfile(cwd2(), $script)
138 unless File::Spec->file_name_is_absolute($script);
140 ($Script,$Bin) = fileparse($script);
142 # Resolve $script if it is a link
145 my $linktext = readlink($script);
147 ($RealScript,$RealBin) = fileparse($script);
148 last unless defined $linktext;
150 $script = (File::Spec->file_name_is_absolute($linktext))
152 : File::Spec->catfile($RealBin, $linktext);
155 # Get absolute paths to directories
158 $Bin = abs_path($Bin);
159 defined $Bin or $Bin = File::Spec->canonpath($BinOld);
161 $RealBin = abs_path($RealBin) if($RealBin);
170 1; # Keep require happy