FindBin

最新推荐文章于 2024-09-29 09:23:55 发布

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最新推荐文章于 2024-09-29 09:23:55 发布

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分类专栏： Perl Study 文章标签： perl path variables tree user c

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本文介绍Perl中的FindBin模块，该模块用于定位原始Perl脚本目录，以便使用相对于该目录的路径。文章解释了如何利用FindBin来配置软件目录树，并讨论了其在不同情况下的行为及已知的问题。

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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 BUGS

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

AUTHORS

Graham Barr <bodg@tiuk.ti.com> Nick Ing-Simmons <nik@tiuk.ti.com>

REVISION

$Revision: 1.4 $