FindBin - Locate directory of original Perl script
use FindBin;use lib "$FindBin::Bin/../lib";use FindBin qw($Bin);use lib "$Bin/../lib";Locates the full path to the script bin directory to allow the use of paths relative to the bin directory.
This allows a user to setup a directory tree for some software with directories<root>/bin and<root>/lib, and then the above example will allow the use of modules in the lib directory without knowing where the software tree is installed.
Ifperl is invoked using the-e option or the Perl script is read fromSTDIN, thenFindBin sets both$Bin and$RealBin to the current directory.
$Bin or$DirPath to the bindirectory from where script was invoked
$ScriptBasename of the script from whichperl was invoked
$RealBin or$RealDir$Bin with all links resolved
$RealScript$Script with all links resolved
You can also use theALL tag to export all of the above variables together:
use FindBin ':ALL';If there are two modules usingFindBin from different directories under the same interpreter, this won't work. SinceFindBin uses aBEGIN block, it'll be executed only once, and only the first caller will get it right. This is a problem undermod_perl and other persistent Perl environments, where you shouldn't use this module. Which also means that you should avoid usingFindBin in modules that you plan to put on CPAN. Call theagain function to make sure thatFindBin will work:
use FindBin;FindBin::again(); # or FindBin->again;In former versions ofFindBin there was noagain function. The workaround was to force theBEGIN block to be executed again:
delete $INC{'FindBin.pm'};require FindBin;FindBin is supported as part of the core perl distribution. Please submit bug reports athttps://github.com/Perl/perl5/issues.
Graham Barr <gbarr@pobox.com> Nick Ing-Simmons <nik@tiuk.ti.com>
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.
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