#!/bin/sh

# defines constant
default_timeout=5

timeout=$default_timeout
if [ -z $1 ]; then
    echo 'Usage: rsh.sh [-t timeout] command'
    echo ' ex) rsh.sh -t 5 a5555.google.com '
    echo ' ex) rsh.sh a5555.google.com '
    exit;
fi

param=$*
while getopts ":t:" opt; do
    case $opt in
        t ) timeout=$OPTARG;;
        \? ) echo "invalid option"
             exit;;
    esac
done

#$1->$0
shift $(($OPTIND - 1))

# background process
rsh "$@" &
backprocess=$!
sleep $timeout; kill -9 $backprocess; echo "time out $timeout seconds"
exit -1;

timeout=$1
case $timeout in
[1-9]*) shift;;
*) timeout=10;;
esac

case $# in
0) echo 'Usage: timeoutrsh [timeout] cmd' >&2; exit;;
esac

rsh "$@" &
p=$!
(sleep $timeout; kill -1 $p) &
k=$!

wait $p
exit=$?
#  Normal exits are 0..127, signals are 128+signo
case $exit in
129)
        echo '(timed out)' >&2
        ;;
*)
        #  Kill the killer.
        kill $k
        ;;
esac
exit $exit