opts4

UNIX[1].shell范例精解(第4版)_code

#!/bin/sh
# Program opts4
# Using getopts -- Fourth try --
while getopts xyz: arguments 2>/dev/null
do
	case $arguments  in
	x) echo "you entered -x as an option.";;
	y) echo "you entered -y as an option.";;
	z) echo "you entered -z as an option."
	     echo "\$OPTARG is $OPTARG.";;
	\?) echo "Usage opts4 [-xy] [-z  argument]"
	     exit 1;;
	esac
done
echo "The initial value of \$OPTIND is 1.
	The final value of \$OPTIND is $OPTIND.
	Since this reflects the number of the next command line 
	argument,the number of arguments passed was 
	`expr $OPTIND - 1`. "