SHELL 编程入门与拔高（四）SHELL脚本中函数的应用

SHELL 编程入门与提高（四）SHELL脚本中函数的应用

和其他编程语言一样，shell程序也支持函数的应用。通过函数将一系列的语句包围起来，通过调用函数名来执行这些语句，免去了在shell程序中书写重复代码的繁琐。

在pdksh/bash中，函数的形式为：

#!/bin/shDisplaymonth(){case $1 in01 | 1) echo “Month is January”;;02 | 2) echo “Month is February”;;03 | 3) echo “Month is March”;;04 | 4) echo “Month is April”;;05 | 5) echo “Month is May”;;06 | 6) echo “Month is June”;;07 | 7) echo “Month is July”;;08 | 8) echo “Month is August”;;09 | 9) echo “Month is September”;;    10) echo “Month is October”;;    11) echo “Month is Novemeber”;;    12) echo “Month is December”;;    *) echo “Invalid parameter;;esac}Displaymonth 8

程序运行的结果为：

Month is August