循环后台作业 [英] Loop background job

问题描述

我尝试在bash中的for循环中运行后台作业:

I try to run a background job in a for loop in bash:

for i in $(seq 3); do echo $i ; sleep 2 & ; done

我收到错误消息:

bash: syntax error near unexpected token `;'

在zsh中，命令行有效.

In zsh the command line works.

推荐答案

删除;睡觉后

for i in $(seq 3); do echo $i ; sleep 2 & done

顺便说一句，这样的循环最好在带有适当缩进的单独行上编写(如果您是在Shell脚本文件中编写的话).

BTW, such loops are better written on separate lines with proper indentation (if you are writing this in a shell script file).

for i in $(seq 3)
do
   echo $i
   sleep 2 &
done

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