Perl中的系统与反引号和管道之间有什么区别? [英] What's the differences between system and backticks and pipes in Perl?

问题描述

Perl支持三种(我知道)运行外部程序的方式:

Perl supports three ways (that I know of) of running external programs:

system:

   system PROGRAM LIST

如:

system "abc";

反引号，如:

`abc`;

通过管道运行它，如下所示:

running it through a pipe as in:

open ABC, "abc|";

它们之间有什么区别?这就是我所知道的:

What are the differences between them? Here's what I know:

1. 您可以使用反引号和管道轻松获得命令的输出.
2. 就是这样(以后会进行更多编辑吗?)

推荐答案

• system():运行命令并返回命令的退出状态
• 反引号:运行命令并返回命令的输出
• pipes:运行命令，并允许您将它们用作句柄
• system(): runs command and returns command's exit status
• backticks: runs command and returns the command's output
• pipes : runs command and allows you to use them as an handle

反引号也将执行的程序的STDOUT重定向到变量，然后系统将其发送到主程序的STDOUT.

Also backticks redirects the executed program's STDOUT to a variable, and system sends it to your main program's STDOUT.

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