{
groufind=`groups|grep system|awk '{print $2}'`
}
        groupscheck
        eval `id  |  /usr/bin/sed 's/[^a-z0-9=].*//'`
        if [ "$LOGNAME != "root"  -o  $groufind != "system" ];
        then
                echo "$0:  Only root or system group can run /sbin/shutdown."
                exit 2
        fi
else
        echo "$0:  can't check user id."
        exit 2

/sbin/shutdown: test: argument expected