Bash getopts

while getopts d:s options
do	case "$options" in
	d)	seplist="$OPTARG";;
	s)	paste=hpaste;;
	[?])	print >&2 "Usage: $0 [-s] [-d seplist] file ..."
		exit 1;;
	esac
done
shift $OPTIND-1

OPTARG 
    stores the value of the option argument found by getopts.

OPTIND 
    contains the index of the next argument to be processed.

parse options from shell script command line