将多个命令通过管道传输到一个命令中 [英] Pipe multiple commands into a single command

问题描述

如何将多个命令的标准输出通过管道传输到单个命令?

How can I pipe the stdout of multiple commands to a single command?

示例 1:对所有三个 echo 命令的输出进行组合和排序:

Example 1: combine and sort the output of all three echo commands:

echo zzz; echo aaa; echo kkk

期望的输出:

aaa
kkk
zzz

示例 2:重写以下内容，以便所有命令都在使用管道的单个命令行中，而不重定向到临时文件:

Example 2: rewrite the following so that all the commands are in a single command-line using pipes, without redirects to a temp file:

setopt > /tmp/foo; unsetopt >> /tmp/foo; set >> /tmp/foo; sort /tmp/foo

推荐答案

使用括号 () 将命令组合成一个进程，这将连接每个进程的标准输出.

Use parentheses ()'s to combine the commands into a single process, which will concatenate the stdout of each of them.

示例1(注意$是shell提示符):

Example 1 (note that $ is the shell prompt):

$ (echo zzz; echo aaa; echo kkk) | sort
aaa
kkk
zzz

示例 2:

(setopt; unsetopt; set) | sort

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