Bash脚本中具有多个条件的for循环 [英] for loop with multiple conditions in Bash scripting

问题描述

自从我进行了大量的bash脚本编写以来，已经有一段时间了，我忘记了在for循环中执行多个条件的语法.

It's been a while since I've done intense bash scripting and I forgot the syntax for doing multiple conditions in a for loop.

在C语言中，我会这样做:

In C, I'd do:

for(var i=0,j=0; i<arrayOne.length && j<arrayTwo.length; i++,j++){
  // Do stuff
}

我已经搜索了一段时间，只发现了涉及嵌套的for循环的语法，而不是涉及到一个for循环的多个条件.

I've been googling for a while and have only found syntax involving nested for loops, not multiple conditions to one for loop.

推荐答案

听起来就像您在谈论算术for循环.

for ((i = j = 0; i < ${#arrayOne[@]} && j < ${#arrayTwo[@]}; i++, j++)); do
    # Do stuff
done

假设未设置i和j或为零，则大约等于:

Which assuming i and j are either unset or zero is approximately equivalent to:

while ((i++ < ${#arrayOne[@]} && j++ < ${#arrayTwo[@]})); do ...

，并且只要您不在乎循环后i/j的值，便可以移植一些.

and slightly more portable so long as you don't care about the values of i/j after the loop.

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