如何在特定时间之前执行bash脚本循环 [英] How to have a bash script loop until a specific time

问题描述

通常要运行一个无限的bash循环，我会执行以下操作:

Usually to run an infinite bash loop, I do something like the following:

while true; do
    echo test
    sleep 1
done

如果相反，我想做一个无限循环的循环，只要它早于20:00.有什么办法可以在bash中做到这一点?

What if instead, I want to do a loop that loops infinitely as long as it is earlier than 20:00. Is there a way to do this in bash?

推荐答案

您可以使用date打印小时，然后与您要查找的小时进行比较:

You can use date to print the hours and then compare to the one you are looking for:

while [ $(date "+%H") -lt 20 ]; do
    echo "test"
    sleep 1
done

date "+%H"显示当前时间，它会一直检查我们是否已经到场或在较小"的时间里.

as date "+%H" shows the current hour, it keeps checking if we are already there or in a "smaller" hour.

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