如何在lib Path中使用变量? [英] How do you use a variable in lib Path?

问题描述

我想在lib路径中使用$ var变量.

I would like to use the $var variable in lib path.

my $var = "/home/usr/bibfile;"

use lib "$var/lib/";

但是，当我这样做时，它会引发错误.

However when I do this it throws an error.

我想使用use lib "$var/lib/";代替use lib "/home/usr/bibfile/lib/";.

如何分配变量，以便可以在lib模块的设置中使用它?

How can I assign a variable, so that it can be used in the setting of lib modules?

推荐答案

变量在use lib中可以正常工作，就像它们在任何字符串中一样.但是，由于所有use指令都是在BEGIN块中执行的，因此在您运行use时，变量尚未进行初始化，因此也需要在BEGIN块中放置初始化.

Variables work fine in use lib, well, just like they do in any string. However, since all use directives are executed in BEGIN block, your variable will be not yet initialized at the moment you run use, so you need to put initialization in BEGIN block too.

my $var;
BEGIN { $var = "/home/usr/bibfile"; }
use lib "$var/lib/";

use Data::Dumper;
print Dumper \@INC;

赠予:

$VAR1 = [
      '/home/usr/bibfile/lib/',
      # ... more ...
    ];

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