“&&"的目的是什么?在一个shell命令? [英] What is the purpose of "&&" in a shell command?

问题描述

据我所知，在命令后使用&在后台运行它.

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

&用法示例:tar -czf file.tar.gz dirname &

但是&&呢? (请看以下示例: https://serverfault.com/questions/215179/centos-100-disk-full-how-to-remove-log-files-history-etc#answer-215188 )

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

推荐答案

&&可让您根据上一个命令是否成功完成执行某些操作-这就是为什么您倾向于将其链接为do_something && do_something_else_that_depended_on_something的原因.

&& 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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