在 Bash 中模拟 do-while 循环 [英] Emulating a do-while loop in Bash

问题描述

在 Bash 中模拟 do-while 循环的最佳方法是什么?

What is the best way to emulate a do-while loop in Bash?

我可以在进入 while 循环之前检查条件，然后在循环中继续重新检查条件，但这是重复的代码.有没有更干净的方法?

I could check for the condition before entering the while loop, and then continue re-checking the condition in the loop, but that's duplicated code. Is there a cleaner way?

我的脚本的伪代码:

while [ current_time <= $cutoff ]; do
    check_if_file_present
    #do other stuff
done

如果在 $cutoff 时间之后启动，则不会执行 check_if_file_present，而 do-while 会.

This doesn't perform check_if_file_present if launched after the $cutoff time, and a do-while would.

推荐答案

两个简单的解决方案:

1. 在 while 循环之前执行一次代码

1. Execute your code once before the while loop

actions() {
   check_if_file_present
   # Do other stuff
}

actions #1st execution
while [ current_time <= $cutoff ]; do
   actions # Loop execution
done

或者:

Or:

while : ; do
    actions
    [[ current_time <= $cutoff ]] || break
done

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