opts4

UNIX+shell范例精解（第4版）代码

#!/bin/ksh
# Program opts4
# Using getopts -- Fourth try --
alias USAGE='print "usage: opts4 [-x] filename " >&2'
while getopts :x: arguments 
do
case $arguments in
     x) print "$OPTARG is the name of the argument ";;
     :) print "Please enter an argument after the -x option" >&2
	   	USAGE ;;
    \?) print "$OPTARG is not a valid option." >&2
	   	USAGE;;
esac
print "$OPTIND" # The number of the next argument to be processed
done