将变量值加1(shell编程) [英] Increment variable value by 1 (shell programming)

问题描述

我是shell编程的初学者，这听起来像是一个非常愚蠢的问题，但是我似乎无法将变量值增加1.我看过

I am a beginner in shell programming, and it sounds like a very stupid question but I can't seem to be able to increase the variable value by 1. I have looked at tutorialspoint's Unix / Linux Shell Programming tutorial but it only shows how to add together two variables.

我尝试了以下方法，但是它们不起作用:

I have tried the following methods but they don't work:

i=0

$i=$i+1 # doesn't work: command not found

echo "$i"

$i='expr $i+1' # doesn't work: command not found

echo "$i"

$i++ # doesn't work*, command not found

echo "$i"

如何将变量的值增加1?

推荐答案

您可以尝试以下方法:

i=0
i=$((i+1))

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