使用案例中的Bash号范围 [英] Using Case for Range of Numbers in Bash

问题描述

我试图做使用CASE以下Bash中（在Linux中）

I am trying to do the following using CASE in Bash (In Linux)

如果X是460和660，输出x信息之间。

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

如果X是661和800之间，做别的事情。

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

等

现在这是我有：

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

但不知何故，许多包括480p，720p或1080p与DVD，而不是结束的几种。变量$ MovieRes是一个简单的列表，其中显示，每行1和1200之间的数字根据不同的值，CASE决定适用的案例。

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情况下做到这一点，因为它是与这样的范围打交道时有点混乱。

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.

作为一个侧面说明，有关于如何使用情况下（bash）的教程任何网站也会有所帮助。

As a side note, any site that has tutorials on how to use CASE (In Bash) would help also.

推荐答案

在bash中，你可以使用算术EX pression ： （（...））

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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