Bash中一系列数字的用例 [英] Using case for a range of numbers in Bash

问题描述

我正在尝试在Bash(在Linux中)中使用case进行以下操作.

I am trying to do the following using case in Bash (in Linux).

如果X在460到660之间，则输出X信息.

If X is between 460 and 660, output X information.

如果X在661和800之间，请执行其他操作.

If X is between 661 and 800, do something else.

等等.

现在这就是我所拥有的:

Right now this is what I have:

case $MovieRes in
    [461-660]*) echo "$MovieName,480p" >> moviefinal ;;
    [661-890]*) echo "$MovieName,720p" >> moviefinal ;;
    [891-1200]*) echo "$MovieName,1080p" >> moviefinal ;;
    *) echo "$MovieName,DVD" >> moviefinal ;;
esac

但是，以某种方式，480p，720p或1080p中的许多将以DVD结尾.变量$MovieRes是一个简单的列表，为每行显示1到1200之间的数字.case根据值决定要应用的大小写".

But somehow many of the ones that are 480p, 720p or 1080p are ending with DVD instead. The variable $MovieRes is a simple list that shows, for each line, a number between 1 and 1200. Depending on the value, case decides which "case" to apply.

我想知道如何实际使用case完成此操作，因为在处理此类范围时会有些混乱.

I would like to know how to actually use case to accomplish this since it is a bit confusing when dealing with ranges like this.

推荐答案

在bash中，您可以使用arithmetic expression:((...))

In bash, you can use the arithmetic expression: ((...))

if ((461<=X && X<=660))
then
    echo "480p"
elif ((661<=X && X<=890))
then
    echo "720p"
elif ((891<=X && X<=1200))
then
    echo "1080p"
else
    echo "DVD"
fi >> moviefinal

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