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1. The echo $? is showing the results of the rsh command. Not the
remotely executed command.
2. rsh has no built-in ability to return the exit code of a remote
command.
3. Use ssh, it does...

Use getopt option as specified below in code..

#!/bin/bash

args=`getopt abc: $*`
if test $? != 0
then
echo 'Usage: -a option_a -b option_b -c option_c'
exit 1
fi
...

Use either

uname -a

or /usr/platform/sun4u/sbin/prtdiag

Use below commands...

who | grep -cv '^[aA]'

finger | grep -cv '^Login|^[aA]'