GNU/Linux man pages
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GNU/Linux |
CentOS 5.6 |
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FindBin(3pm) |
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FindBin − Locate directory of original perl script
use FindBin; use lib "$FindBin::Bin/../lib"; or use FindBin qw($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.
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.
$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 "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;
If perl is invoked as
perl filename
and filename does not have executable rights and a program called filename exists in the users $ENV{PATH} which satisfies both −x and −T then FindBin assumes that it was invoked via the $ENV{PATH}.
Workaround is to invoke perl as
perl ./filename
FindBin is supported as part of the core perl distribution. Please send bug reports to <perlbug@perl.org> using the perlbug program included with perl.
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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FindBin(3pm) | |