SHELL 编程入门与提高（三）SHELL中的语句详解（下）
for语句

pdksh/bash下for语句的第一种形式是：

#!/bin/tcshset day = 5switch ( $day )case 1: echo “Today is Monday”; breakswcase 2: echo “Today is Thuesday”; breakswcase 3: echo “Today is Wednesday”; breakswcase 4: echo “Today is Thursday”; breakswcase 5: echo “Today is Friday”; breakswcase 6: echo “Today is Saturday”; breakswcase 7: echo “Today is Sunday”; breakswdefault: echo “Oops! Day is Error!” ; breakswendsw

我们需要掌握break和exit的用法。break通常被用来终止一个循环，比如for，until，repeat命令。exit语句通常用来终止一个shell程序。你可以通过exit返回一个数值，当其他程序调用这个shell程序时，可以通过返回的这个数值（$?或者$status变量）来作出相应的决策。