line Bash infinite while loop

2018-06-05 12:26:16

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

while true; do foo; sleep 2; done

顺便说一句，如果您在命令提示符下键入多行（如您所示），然后用箭头向上调用历史记录，则您将在单行中得到它，并且正确地加上标点符号。

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

It's also possible to use sleep command in while's condition. Making one-liner looking more clean imho.

while sleep 2; do echo thinking; done

冒号总是“真实的”：

while :; do foo; sleep 2; done

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