RETVAL=0 ?

" RETVAL=0 " 이것이 뜻하는것이 정확이 무엇인지요?

찾아바도 자세히 설면한곳이 없어서 도움청합니다.

감사합니다.

모두들 즐거운 하루 되시길바랍니다..^__^+

#!/bin/bash
#
# sendmail This shell script takes care of starting and stopping
# sendmail.
#
# chkconfig: 2345 80 30
# description: Sendmail is a Mail Transport Agent, which is the program \
# that moves mail from one machine to another.
# processname: sendmail
# config: /etc/mail/sendmail.cf
# pidfile: /var/run/sendmail.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Source sendmail configureation.
if [ -f /etc/sysconfig/sendmail ] ; then
. /etc/sysconfig/sendmail
else
DAEMON=no
QUEUE=1h
fi
[ -z "$SMQUEUE" ] && SMQUEUE="$QUEUE"
[ -z "$SMQUEUE" ] && SMQUEUE=1h

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

[ -f /usr/sbin/sendmail ] || exit 0

RETVAL=0
prog="sendmail"

start() {
# Start daemons.

echo -n $"Starting $prog: "
/usr/bin/newaliases > /dev/null 2>&1
if test -x /usr/bin/make -a -f /etc/mail/Makefile ; then
make all -C /etc/mail -s
else
for i in virtusertable access domaintable mailertable ; do
if [ -f /etc/mail/$i ] ; then
makemap hash /etc/mail/$i < /etc/mail/$i
fi
done
fi
daemon /usr/sbin/sendmail $([ "x$DAEMON" = xyes ] && echo -bd) \
$([ -n "$QUEUE" ] && echo -q$QUEUE) \
$([ -n "$CFG" ] && echo -C $CFG)
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/sendmail

if ! test -f /var/run/sm-client.pid ; then
echo -n $"Starting sm-client: "
touch /var/run/sm-client.pid
chown smmsp:smmsp /var/run/sm-client.pid
daemon --check sm-client /usr/sbin/sendmail -L sm-msp-queue -Ac \
-q$SMQUEUE
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/sm-client
fi

return $RETVAL
}

stop() {
# Stop daemons.
echo -n $"Shutting down $prog: "
killproc sendmail
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/sendmail
if test -f /var/run/sm-client.pid ; then
echo -n $"Shutting down sm-client: "
killproc sm-client
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/run/sm-client.pid
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/sm-client
fi
return $RETVAL
}

# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
stop
start
RETVAL=$?
;;
condrestart)
if [ -f /var/lock/subsys/sendmail ]; then
stop
start
RETVAL=$?
fi
;;
status)
status sendmail
RETVAL=$?
;;
*)
echo $"Usage: $0 {start|stop|restart|condrestart|status}"
exit 1
esac

exit $RETVAL