“&"是什么意思在linux命令末尾是什么意思? [英] What does "&" at the end of a linux command mean?

问题描述

我是系统管理员，被要求运行linux脚本来清理系统.

I am a system administrator and I have been asked to run a linux script to clean the system.

命令是这样的:

perl script.pl > output.log &

所以该命令以&符号结尾，它有什么特殊意义吗?

so this command is ending with a & sign, is there any special significance of it?

我对shell有基本的了解，但是我以前从未见过.

I have basic knowledge of shell but I have never seen this before.

推荐答案

&使命令在后台运行.

来自man bash:

如果命令被控制操作员& 终止，则外壳 在子外壳程序中在后台执行命令.壳做 不要等待命令完成，并且 返回状态为0.

If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0.

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