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问题描述

Perl中的库文件和模块之间有什么区别?

What is the difference between library files and modules in Perl?

推荐答案

所有这些都是perl的Perl代码.所有区别纯粹是习惯用法.

It's all Perl code to perl. All distinctions are purely idiomatic.

使用package指令包含的Perl代码:

Perl code meant for inclusion that uses a package directive:

  • 称为模块".
  • 通常具有扩展名.pm. use必须具有此扩展名才能找到它们.
  • 应该始终通过 use .
  • 模块化程度更高,CPAN支持更好.
  • Called "module".
  • Usually have the extension .pm. Must have this extension for use to find them.
  • Should always be loaded with require, possibly via use.
  • More modular, better supported by CPAN.

要包含的Perl代码不使用package指令:

Perl code meant for inclusion that doesn't use a package directive:

  • 称为图书馆".
  • 通常使用扩展名.pl.
  • 应该始终加载 do .
  • 污染呼叫者的名称空间.
  • 通常表示设计不合标准. 避免这些!
  • Called "library".
  • Usually have the extension .pl.
  • Should always be loaded with do.
  • Pollutes the caller's namespace.
  • Usually indicative of a substandard design. Avoid these!

Perl代码供解释器直接执行:

Perl code meant for direct execution by interpreter:

  • 称为脚本".
  • 通常具有扩展名.pl,或者根本没有扩展名.
  • 可能会以shebang(#!)行开头,这样就可以在不指定perl的情况下启动它们.
  • Called "script".
  • Usually have the extension .pl, or none at all.
  • Will probably start with a shebang (#!) line so they can be started without specifying perl.

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08-28 00:09
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