Hi,
And here is the shell code,
[parseoptions.sh]
#!/bin/sh
# script to parse options using getopts
while getopts 'ab:' OPTION
do
case "${OPTION}"
in
a) echo "-a supplied";;
b) echo "-b supplied with '${OPTARG}'";;
*) echo "Wrong option '${OPTION}' supplied";;
esac
done
shift $((OPTIND - 1))
echo "Remaining Arguments '$...@}'"
$ ./parseoptions.sh -a -b apple orange banana
-a supplied
-b supplied with 'apple'
Remaining Arguments 'orange banana'
$
[parseoption.sh]
#!/bin/sh
# script to parse options using getopt
PARSEDOPTIONS=$(getopt -o 'ab:' --longoptions 'long-x,long-y,long-z:' --
"$...@}")
set -- ${PARSEDOPTIONS}
while test "${1}" != "--"
do
case "${1}"
in
-a) echo "-a supplied"; shift;;
-b) echo "-b supplied with ${2}"; shift 2;;
--long-x) echo "--long-x supplied"; shift;;
--long-y) echo "--long-y supplied"; shift;;
--long-z) echo "--long-z supplied with ${2}"; shift 2;;
*) echo "Wrong option ${1} supplied"; shift;;
esac
done
shift
echo "Remaining arguments $...@}"
$ ./parseoption.sh -a -b apple --long-x --long-y --long-z orange banana
-a supplied
-b supplied with 'apple'
--long-x supplied
--long-y supplied
--long-z supplied with 'orange'
Remaining arguments 'banana'
$
And finally, one of the key difference between these two is, 'getopts'
is POSIX shell built-in, where 'getopt' is a separate executable living
inside '/usr/bin/'. Another difference is, 'getopts' cannot parse
options like '--big-option' whereas 'getopt' can.
I hope above examples will help you to understand getopts and getopt.
Its a standard practice to parse options inside your shell script using
getopts/getopt. Please read 'man getopt' and 'man sh'(then search for
getopts) for reference.
Thanks,
Mohan R.
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