Bash 中单行 while 循环的语法 [英] Syntax for a single-line while loop in Bash

问题描述

我在想出分号和/或大括号的正确组合时遇到了麻烦.我想这样做，但作为命令行中的单行:

I am having trouble coming up with the right combination of semicolons and/or braces. I'd like to do this, but as a one-liner from the command line:

while [ 1 ]
do
    foo
    sleep 2
done

推荐答案

while true; do foo; sleep 2; done

顺便说一句，如果您在命令提示符下将其输入为多行(如您所示)，然后使用向上箭头调用历史记录，您将在一行中找到它，标点正确.

By the way, if you type it as a multiline (as you are showing) at the command prompt and then call the history with arrow up, you will get it on a single line, correctly punctuated.

$ while true
> do
>    echo "hello"
>    sleep 2
> done
hello
hello
hello
^C
$ <arrow up> while true; do    echo "hello";    sleep 2; done

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