man > FindBin

FindBin(3perl)                    Perl Programmers Reference Guide                    FindBin(3perl)

NAME
       FindBin - Locate directory of original perl script

SYNOPSIS
        use FindBin;
        use lib "$FindBin::Bin/../lib";

        or

        use FindBin qw($Bin);
        use lib "$Bin/../lib";

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 "<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.

       If perl is invoked using the -e option or the perl script is read from "STDIN" then FindBin
       sets both $Bin and $RealBin to the current directory.

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

KNOWN ISSUES
       If there are two modules using "FindBin" from different directories under the same
       interpreter, this won't work. Since "FindBin" uses a "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 "FindBin" in modules that you plan to put on CPAN. To make sure that
       "FindBin" will work is to call the "again" function:

         use FindBin;
         FindBin::again(); # or FindBin->again;

       In former versions of FindBin there was no "again" function. The workaround was to force the
       "BEGIN" block to be executed again:

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

AUTHORS
       FindBin is supported as part of the core perl distribution.  Please submit bug reports at
       <https://github.com/Perl/perl5/issues>.

       Graham Barr <gbarr AT pobox.com> Nick Ing-Simmons <nik AT tiuk.com>

COPYRIGHT
       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.

perl v5.38.2                                 2026-08-18                               FindBin(3perl)