命令行 - 是什么目的＆QUOT;＆放大器;＆安培;＆QUOT;？ [英] command-line - what is the purpose of "&&"?

问题描述

据我所知，使用＆放大器; 之后的命令是在后台运行，它

As far as I know, using & after the command is for running it in the background.

示例＆安培; 用法：焦油-czf file.tar.gz目录名和放大器;

但如何对＆放大器;＆安培; ？ （看看下面这个例子：<一href=\"http://serverfault.com/questions/215179/centos-100-disk-full-how-to-remove-log-files-history-etc#answer-215188\">http://serverfault.com/questions/215179/centos-100-disk-full-how-to-remove-log-files-history-etc#answer-215188)

But how about &&? (look at this example: http://serverfault.com/questions/215179/centos-100-disk-full-how-to-remove-log-files-history-etc#answer-215188)

推荐答案

＆放大器;＆安培; 可让您根据在previous命令是否成功完成做些什么 - 这就是为什么你会看到它链接为 do_something和放大器;＆安培; do_something_else_that_depended_on_something 。

&& lets you do something based on whether the previous command completed successfully - that's why you tend to see it chained as do_something && do_something_else_that_depended_on_something.

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