#!/bin/bash
#
# Copyright (C) 1994-2021 Altair Engineering, Inc.
# For more information, contact Altair at www.altair.com.
#
# This file is part of both the OpenPBS software ("OpenPBS")
# and the PBS Professional ("PBS Pro") software.
#
# Open Source License Information:
#
# OpenPBS is free software. You can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# OpenPBS is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Commercial License Information:
#
# PBS Pro is commercially licensed software that shares a common core with
# the OpenPBS software.  For a copy of the commercial license terms and
# conditions, go to: (http://www.pbspro.com/agreement.html) or contact the
# Altair Legal Department.
#
# Altair's dual-license business model allows companies, individuals, and
# organizations to create proprietary derivative works of OpenPBS and
# distribute them - whether embedded or bundled with other software -
# under a commercial license agreement.
#
# Use of Altair's trademarks, including but not limited to "PBS™",
# "OpenPBS®", "PBS Professional®", and "PBS Pro™" and Altair's logos is
# subject to Altair's trademark licensing policies.

#

#
#    PBS init script
#
#        Recognized arguments:
#            start   - start PBS
#            stop    - terminate PBS
#            restart - terminate and start PBS
#            status  - report PBS deamon pids
#
#
# chkconfig: 35 90 10
# description: The Portable Batch System (PBS) is a flexible workload
# management  system. It operates on # networked, multi-platform UNIX
# environments, including heterogeneous clusters of workstations,
# supercomputers, and massively parallel systems.
#
### BEGIN INIT INFO
# Provides:       pbs
# Required-Start: $network $local_fs $remote_fs $named
# Should-Start: $sshd
# Required-Stop:  $network $local_fs $remote_fs $named
# Default-Start:  3 5
# Default-Stop:   0 1 2 4 6
# Description:    Portable Batch System
### END INIT INFO

if [ $# -eq 1 ] && [ $1 = "--version" ]; then
	echo pbs_version = @PBS_VERSION@
	exit 0
fi

tmpdir=${PBS_TMPDIR:-${TMPDIR:-"/var/tmp"}}
ostype=`uname 2>/dev/null`

getpid() {
	if [ -f $1 ]; then
		cat $1
	else
		echo -1
	fi
}

# update_pids may cause an I/O read to block if PBS_HOME is on a shared
# mount, it is called selectively after sanity checks are performed
update_pids() {
	pbs_server_pid=`getpid ${PBS_HOME}/server_priv/server.lock`
	pbs_secondary_server_pid=`getpid ${PBS_HOME}/server_priv/server.lock.secondary`
	pbs_mom_pid=`getpid ${PBS_MOM_HOME}/mom_priv/mom.lock`
	pbs_sched_pid=`getpid ${PBS_HOME}/sched_priv/sched.lock`
	pbs_secondary_sched_pid=`getpid ${PBS_HOME}/sched_priv/sched.lock.secondary`
	pbs_comm_pid=`getpid ${PBS_HOME}/server_priv/comm.lock`
	pbs_secondary_comm_pid=`getpid ${PBS_HOME}/server_priv/comm.lock.secondary`
}

# lc_host_name - convert host name into lower case short host name
# also handle multiple names in PBS_LEAF_NAME
# PBS_LEAF_NAME is now of the format: host:port,host:port so the following code is to cut on , (to get the first host) and then : to parse our the port
lc_host_name()
{
  echo $1 | cut -d, -f1 | cut -d: -f1 | cut -d. -f1 | sed -e "y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"
}

# check_started - check if a particular pid is the program which is expected.
#                 pbs stores the pid of the currently running incarnation of
#                 itself.  This function is used to see if that pid is correct
#                  program.
#         $1 - the pid
#         $2 - the program name (pbs_server pbs_mom pbs_sched)
#
# return value: 0 - program is already running
#                1 - program is not running
#
: check_started
check_started() {
	ps_out=`ps -p $1 -o args 2> /dev/null | tail -1`
	if [ -z "${ps_out}" -o "`echo ${ps_out} | cut -c1`" = "[" ]; then
		ps_out=`ps -p $1 -o command 2> /dev/null | tail -1`
		if [ -z "${ps_out}" ]; then
			return 1
		fi
	fi

	# strip out everything except executable name
	prog_name=`echo ${ps_out} | grep -how "$2"`
	if [ "x${prog_name}" = "x$2" ]; then
		return 0;
	fi

	return 1;
}

# check_prog - this function checks to see if a prog is still running.  It will
#              get the pid out of the prog.lock file and run check_started
#               on that pid.
#
#        $1 is either "server" "pbs_comm" "mom" or "sched"
#
# return value: 0 - program is still running
#                1 - program is not running
#
: check_prog
check_prog() {

	case $1 in
		mom)
			daemon_name="pbs_mom"
			pid=${pbs_mom_pid} ;;
		server)
			daemon_name="pbs_server.bin"
			if [ ${is_secondary} -eq 0 ] ; then
				pid=${pbs_server_pid}
			else
				pid=${pbs_secondary_server_pid}
			fi ;;
		sched)
			daemon_name="pbs_sched"
			if [ ${is_secondary} -eq 0 ] ; then
				pid=${pbs_sched_pid} ;
			else
				pid=${pbs_secondary_sched_pid} ;
			fi ;;
		pbs_comm)
			daemon_name="pbs_comm"
			if [ ${is_secondary} -eq 0 ] ; then
				pid=${pbs_comm_pid} ;
			else
				pid=${pbs_secondary_comm_pid} ;
			fi ;;

		*)	echo Invalid PBS daemon name: $1 >&2;
			return 1;;
	esac

	if [ -n "${pid}" ]; then
		if [ "${pid}" -ne -1 ] ; then
			if check_started "${pid}" "${daemon_name}" ; then
				return 0
			fi
		fi
	fi

	# Since the pid file does not exist, PBS has never been run
	return 1
}

# Look to see if restrict_user_maxsysid exists in MOM config file
# If it is there, nothing else needs to be done.
# Otherwise, see if a default can be determined from login.defs.
check_maxsys()
{
	if grep '^$restrict_user_maxsysid' ${PBS_MOM_HOME}/mom_priv/config > /dev/null ; then
		return
	fi

	file=/etc/login.defs
	if [ -f ${file} ]; then
		val=`awk '$1 == "SYSTEM_UID_MAX" {print $2}' ${file}`
		if [ -z "${val}" ]; then
			val=`awk '$1 == "UID_MIN" {print $2 - 1}' ${file}`
		fi
		if [ -n "${val}" ]; then
			echo '$restrict_user_maxsysid' ${val} \
				>> ${PBS_MOM_HOME}/mom_priv/config
		fi
	fi
}

# Look if core or core.pid file exists in given _priv directory
# If exists format the name to core_<next_sequence_number>
# When core file found set core flag
check_core() {
	core_dir="$1"
	[ -n "${core_dir}" ] || core_dir="."

	core_list=`/bin/ls -1 "${core_dir}"/core* 2> /dev/null`
	if [ -n "${core_list}" ]; then
		seq_files=`echo "${core_list}" | grep "core_"`
		if [ $? -eq 0 ]; then
			max_seq=`echo "${seq_files}" | sed -e 's/[^0-9 ]*//g' | sort -n | tail -1`
		else
			max_seq=0
		fi

		for core_name in `/bin/ls "${core_dir}"/core* | grep -v "core_" 2> /dev/null`
		do
			max_seq=`expr ${max_seq} + 1`
			new_seq=`printf "%04d" ${max_seq}`
			mv ${core_name} "${core_dir}"/"core_${new_seq}"
		done

		core_flag=1
	fi
}

# Return the name of the PBS server host
get_server_hostname() {
	shn=""
	if [ -z "${PBS_PRIMARY}" -o -z "${PBS_SECONDARY}" ] ; then
		if [ -z "${PBS_SERVER_HOST_NAME}" ]; then
			shn="${PBS_SERVER}"
		else
			shn="${PBS_SERVER_HOST_NAME}"
		fi
	else
		shn="${PBS_PRIMARY}"
	fi
	echo `lc_host_name "${shn}"`
}

# Ensure the supplied hostname is valid
check_hostname() {
	# Check the hosts file
	getent hosts "$1" >/dev/null 2>&1 && return 0
	# Check DNS
	host "$1" >/dev/null 2>&1 && return 0
	return 1
}

start_pbs() {
	echo "Starting PBS"

	# Perform sanity checks
	server_hostname=`get_server_hostname`
	if [ -z "${server_hostname}" -o "${server_hostname}" = 'CHANGE_THIS_TO_PBS_SERVER_HOSTNAME' ] ; then
		echo "***" >&2
		echo "*** The hostname of the PBS server in ${conf} is invalid." >&2
		echo "*** Update the configuration file before starting PBS." >&2
		echo "***" >&2
		exit 1
	fi
	check_hostname "${server_hostname}"
	if [ $? -ne 0 ]; then
		echo "***" >&2
		echo "*** The PBS server could not be found: ${server}" >&2
		echo "*** This value must resolve to a valid IP address." >&2
		echo "***" >&2
		exit 1
	fi

	update_pids

	# See if we need to populate PBS_HOME. We do if...
	# 1) PBS_HOME doesn't exist  (needmakehome=1 -> create PBS_HOME)
	# 2) PBS_HOME/pbs_version doesn't exist
	# 3) if the version number in PBS_HOME/pbs_version does not match
	#    the version of the commands  (2 and 3 needmakehome=2 -> update)
	# 4) PBS_HOME/datastore does not exist and this is a server
	needmakehome=0
	[ ! -d "${PBS_HOME}" ] && needmakehome=1
	[ ${needmakehome} -eq 0 -a ! -f "${PBS_HOME}/pbs_version" ] && needmakehome=2
	if [ ${needmakehome} -eq 0 ]; then
		qstatver=`${PBS_EXEC}/bin/qstat --version | sed -e "s/^.* = //"`
		homever=`cat ${PBS_HOME}/pbs_version`
		[ "${qstatver}" != "${homever}" ] && needmakehome=3
	fi
	[ ${needmakehome} -eq 0 -a "${PBS_START_SERVER}" != "0" -a ! -d "${PBS_HOME}/datastore" ] && needmakehome=4

	if [ ${needmakehome} -ne 0 -a ! -x ${PBS_EXEC}/libexec/pbs_habitat ]; then
		echo "***" >&2
		echo "*** ${PBS_EXEC}/libexec/pbs_habitat is missing." >&2
		echo "***" >&2
		exit 1
	fi

	case ${needmakehome} in
		1)
			echo PBS Home directory ${PBS_HOME} does not exist.
			echo Running ${PBS_EXEC}/libexec/pbs_habitat to create it.
			${PBS_EXEC}/libexec/pbs_habitat || return 1
			echo Home directory ${PBS_HOME} created.
			;;
		2|3)
			echo PBS Home directory ${PBS_HOME} needs updating.
			echo Running ${PBS_EXEC}/libexec/pbs_habitat to update it.
			${PBS_EXEC}/libexec/pbs_habitat || return 1
			echo Home directory ${PBS_HOME} updated.
			;;
		4)
			echo PBS Home directory ${PBS_HOME} needs datastore.
			echo Running ${PBS_EXEC}/libexec/pbs_habitat to initialize it.
			${PBS_EXEC}/libexec/pbs_habitat || return 1
			echo Datastore directory ${PBS_HOME}/datastore initialized.
			;;
	esac

	core_flag=0
	if [ -d ${PBS_HOME}/server_priv ]; then
		check_core ${PBS_HOME}/server_priv
	fi
	if [ -d ${PBS_HOME}/sched_priv ]; then
		check_core ${PBS_HOME}/sched_priv
	fi
	if [ -d ${PBS_HOME}/mom_priv ]; then
		check_core ${PBS_HOME}/mom_priv
	fi

	if [ ${core_flag} -eq 1 ];then
		echo "Warning: PBS has detected core file(s) in PBS_HOME that require attention!!!"
		echo "Warning: Please inform your administrator immediately or contact Altair customer support"
	fi

	if [ "${PBS_START_COMM}" -gt 0 ]; then
		if check_prog "pbs_comm" ; then
			echo "PBS comm already running."
		else
			if ${PBS_EXEC}/sbin/pbs_comm
			then
				echo "PBS comm"
			else
				ret_val=$?
				echo "pbs_comm startup failed, exit ${retval} aborting." >&2
				exit 1
			fi
		fi
	fi

	if [ "${PBS_START_MOM}" -gt 0 ]; then
		if check_prog "mom" ; then
			echo "PBS mom already running."
		else
			if [ -f ${pbslibdir}/init.d/limits.pbs_mom ]; then
				. ${pbslibdir}/init.d/limits.pbs_mom
			fi
			check_maxsys

			if  ${PBS_EXEC}/sbin/pbs_mom
			then
				echo "PBS mom"
			else
				ret_val=$?
				echo "pbs_mom startup failed, exit ${ret_val} aborting." >&2
				return 1
			fi
		fi
	fi

	if [ "${PBS_START_SCHED}" -gt 0 ]; then
		if check_prog "sched" ; then
			echo "PBS scheduler already running."
		else
			if [ -f ${pbslibdir}/init.d/limits.pbs_sched ]; then
				. ${pbslibdir}/init.d/limits.pbs_sched
			fi
			if ${PBS_EXEC}/sbin/pbs_sched
			then
				echo "PBS sched"
			else
				ret_val=$?
				echo "pbs_sched startup failed, exit ${ret_val} aborting." >&2
				return 1
			fi
		fi
	fi

	if [ "${PBS_START_SERVER}" -gt 0 ] ; then
		if check_prog "server" ; then
			echo "PBS Server already running."
		else
			if [ -f ${pbslibdir}/init.d/limits.pbs_server ] ; then
				. ${pbslibdir}/init.d/limits.pbs_server
			fi
			if ${PBS_EXEC}/sbin/pbs_server ; then
				echo "PBS server"
			else
				ret_val=$?
				if [ ${ret_val} -eq 4 ] ; then
					echo "pbs_server failed to start, will retry once in 30 seconds" >&2
					sleep 30
					if ${PBS_EXEC}/sbin/pbs_server ; then
						echo "PBS server"
					else
						ret_val=$?
						echo "pbs_server startup failed, exit ${ret_val} aborting." >&2
						return 1
					fi
				else
					echo "pbs_server startup failed, exit ${ret_val} aborting." >&2
					return 1
				fi
			fi
		fi
	fi

	if [ -f ${pbslibdir}/init.d/limits.post_services ] ; then
		. ${pbslibdir}/init.d/limits.post_services
	fi
	if [ -f /etc/redhat-release ]; then
		touch ${redhat_subsys_filepath}
	fi

	return 0
}

stop_pbs() {
	echo "Stopping PBS"
	update_pids
	if [ "${PBS_START_SERVER}" -gt 0 ] ; then
		active_server=`lc_host_name \`${PBS_EXEC}/bin/qstat -Bf 2>/dev/null | \
		grep "server_host = " | \
		sed -e "s/.*server_host = //"\``
		if check_prog "server" ; then
			if [ "${my_hostname}" = "${active_server}" ]; then
				if [ -z "${PBS_SECONDARY}" -o ${is_secondary} -eq 1 ]; then
					echo "Shutting server down with qterm."
				else
					echo "This is active server, shutting down with qterm, secondary will take over."
				fi
				if [ -r "${PBS_HOME}/server_priv/qmgr_shutdown" ]; then
					echo "pbs_server evaluating ${PBS_HOME}/server_priv/qmgr_shutdown"
					${PBS_EXEC}/bin/qmgr <"${PBS_HOME}/server_priv/qmgr_shutdown"
				fi
				${PBS_EXEC}/bin/qterm -t quick
				echo "PBS server - was pid: ${pbs_server_pid}"
			elif [ ${is_secondary} -eq 1 ]; then
				echo "This is secondary server, killing process."
				kill ${pbs_secondary_server_pid}
				echo "PBS server - was pid: ${pbs_secondary_server_pid}"
				rm -f ${PBS_HOME}/server_priv/server.lock.secondary
			else
				echo "Killing Server."
				kill ${pbs_server_pid}
				echo "PBS server - was pid: ${pbs_server_pid}"
			fi
		fi
		${PBS_EXEC}/sbin/pbs_dataservice status > /dev/null 2>&1
		if [ $? -eq 0 ]; then
			${PBS_EXEC}/sbin/pbs_dataservice stop > /dev/null 2>&1
		fi
	fi
	if [ "${PBS_START_MOM}" -gt 0 ] ; then
		if check_prog "mom" ; then
			kill ${pbs_mom_pid}
			echo "PBS mom - was pid: ${pbs_mom_pid}"
		fi
	fi
	if [ "${PBS_START_SCHED}" -gt 0 ] ; then
		if check_prog "sched" ; then
			if [ ${is_secondary} -eq 0 ] ; then
				kill ${pbs_sched_pid}
				echo "PBS sched - was pid: ${pbs_sched_pid}"
			else
				kill ${pbs_secondary_sched_pid}
				echo "PBS schedx - was pid: ${pbs_secondary_sched_pid}"
				rm -f ${PBS_HOME}/sched_priv/sched.lock.secondary
			fi
		fi
	fi
	if [ "${PBS_START_COMM}" -gt 0 ] ; then
		if check_prog "pbs_comm" ; then
			if [ ${is_secondary} -eq 0 ] ; then
				kill -TERM ${pbs_comm_pid}
				echo "PBS comm - was pid: ${pbs_comm_pid}"
			else
				kill -TERM ${pbs_secondary_comm_pid}
				echo "PBS comm - was pid: ${pbs_secondary_comm_pid}"
				rm -f ${PBS_HOME}/server_priv/comm.lock.secondary
			fi
		fi
	fi
	if [ -f ${redhat_subsys_filepath} ] ; then
		rm -f ${redhat_subsys_filepath}
	fi
	# make sure the daemons have exited for up to 180 seconds
	# if any still there, exit with message and error
	waitloop=1
	echo "Waiting for shutdown to complete"
	while [ ${waitloop} -lt 180 ]
	do
		sleep 1
		something_running=""
		if [ "${PBS_START_SERVER}" -gt 0 ] ; then
			if check_prog "server" ; then
				something_running=" pbs_server"
			fi
		fi
		if [ "${PBS_START_MOM}" -gt 0 ] ; then
			if check_prog "mom" ; then
				something_running="${something_running} pbs_mom"
			fi
		fi
		if [ "${PBS_START_SCHED}" -gt 0 ] ; then
			if check_prog "sched" ; then
				something_running="${something_running} pbs_sched"
			fi
		fi
		if [ "${PBS_START_COMM}" -gt 0 ] ; then
			if check_prog "pbs_comm" ; then
				something_running=" pbs_comm"
			fi
		fi
		if [ "${something_running}" = "" ]; then
			return
		fi
		waitloop=`expr ${waitloop} + 1`
	done
	echo "Unable to stop PBS,${something_running} still active"
	exit 1
}

status_pbs() {
	update_pids
	if [ "${PBS_START_SERVER}" -gt 0 ]; then
		if check_prog "server" ; then
			echo "pbs_server is pid ${pid}"
		else
			echo "pbs_server is not running"
		fi
	fi
	if [ "${PBS_START_MOM}" -gt 0 ]; then
		if check_prog "mom" ; then
			echo "pbs_mom is pid ${pbs_mom_pid}"
		else
			echo "pbs_mom is not running"
		fi
	fi
	if [ "${PBS_START_SCHED}" -gt 0 ]; then
		if check_prog "sched" ; then
			echo "pbs_sched is pid ${pbs_sched_pid}"
		else
			echo "pbs_sched is not running"
		fi
	fi
	if [ "${PBS_START_COMM}" -gt 0 ]; then
		if check_prog "pbs_comm" ; then
			echo "pbs_comm is ${pbs_comm_pid}"
		else
			echo "pbs_comm is not running"
		fi
	fi
}

# Check whether PBS is registered to start at boot time
is_registered()
{
	if command -v systemctl >/dev/null 2>&1; then
		systemctl is-enabled pbs > /dev/null 2>&1
		return $?
	elif command -v chkconfig; then
		chkconfig pbs > /dev/null 2>&1
		return $?
	fi
	return 0
}

# Check whether system is being booted or not
# and also update the time in /var/tmp/pbs_boot_check file
# return 0 if system is being booted otherwise return 1
is_boottime()
{
	is_registered
	[ $? -ne 0 ] && return 1

	PYTHON_EXE=${PBS_EXEC}/python/bin/python
	if [ -z "${PYTHON_EXE}" -o ! -x "${PYTHON_EXE}" ] ; then
		PYTHON_EXE=`type python3 2>/dev/null | cut -d' ' -f3`
		if [ -z "${PYTHON_EXE}" -o ! -x "${PYTHON_EXE}" ] ; then
			return 1
		fi
	fi

	BOOTPYFILE="${pbslibdir}/python/pbs_bootcheck.py"
	BOOTCHECKFILE="/var/tmp/pbs_boot_check"

	if [ ! -r "${BOOTPYFILE}" ] ; then
		return 1
	fi

	${PYTHON_EXE} ${BOOTPYFILE} ${BOOTCHECKFILE} > /dev/null 2>&1
	ret=$?
	return ${ret}
}

pre_start_pbs()
{
	if is_boottime
	then
		case "${ostype}" in
			Linux) echo -e "\nStarting PBS in background\c" ;;
			*)  echo "\nStarting PBS in background\c" ;;
		esac
		(
			TEMP_DIR=${PBS_TMPDIR:-${TMPDIR:-"/var/tmp"}}
			TEMPFILE=${TEMP_DIR}/start_pbs_logs_tmp_$$
			start_pbs > ${TEMPFILE} 2>&1
			ret=$?
			logger -i -t PBS -f ${TEMPFILE}
			rm -f ${TEMPFILE}
			exit ${ret}
		) &
	else
		start_pbs
		exit $?
	fi
}

: main code
# save env variables in a temp file
env_save="/tmp/$$_$(date +'%s')_env_save"
declare -x > "${env_save}"

conf=${PBS_CONF_FILE:-@PBS_CONF_FILE@}
[ -r "${conf}" ] && . "${conf}"

# re-apply saved env variables
. "${env_save}"

rm -f "${env_save}"

if [ -z "${PBS_EXEC}" ]; then
	echo "PBS_EXEC is undefined." >&2
	exit 1
fi
if [ ! -d "${PBS_EXEC}" ]; then
	echo "${PBS_EXEC} is not a directory." >&2
	echo "PBS_EXEC directory does not exist: ${PBS_EXEC}" >&2
	exit 1
fi

pbslibdir="${PBS_EXEC}/lib"
[ ! -d "${pbslibdir}" -a -d "${PBS_EXEC}/lib64" ] && pbslibdir="${PBS_EXEC}/lib64"

if [ -z "${PBS_HOME}" ]; then
	echo "PBS_HOME is undefined." >&2
	exit 1
fi

[ -z "${PBS_START_SERVER}" ] && PBS_START_SERVER=0
[ -z "${PBS_START_MOM}" ] && PBS_START_MOM=0
[ -z "${PBS_START_SCHED}" ] && PBS_START_SCHED=0
[ -z "${PBS_START_COMM}" ] && PBS_START_COMM=0

UNIX95=1
export UNIX95
PBS_MOM_HOME=${PBS_MOM_HOME:-$PBS_HOME}

redhat_subsys_filepath="/var/lock/subsys/pbs"

# Determine the hostname that the local system should use
if [ -n "${PBS_LEAF_NAME}" ]; then
	my_hostname=`lc_host_name "${PBS_LEAF_NAME}"`
else
	my_hostname=`lc_host_name \`hostname\``
fi

# Check whether the hostname has an IP address
check_hostname "${my_hostname}"
if [ $? -ne 0 ]; then
	echo "***" >&2
	echo "*** Invalid local hostname: $my_hostname" >&2
	echo "*** This value must resolve to a valid IP address." >&2
	echo "***" >&2
	exit 1
fi

is_secondary=0
if [ -n "${PBS_SECONDARY}" ]; then
	sec_host=`lc_host_name ${PBS_SECONDARY}`
	if [ ${sec_host} = ${my_hostname} ]; then
		is_secondary=1
	fi
fi

# lets see how we were called
case "`basename $0`" in
	pbs_start)
		pre_start_pbs
		;;
	pbs_stop)
		stop_pbs
		;;
	*)
		case "$1" in
			start_msg)
				echo "Starting PBS"
				;;
			stop_msg)
				echo "Stopping PBS"
				;;
			status)
				status_pbs
				;;
			start)
				pre_start_pbs
				;;
			stop)
				stop_pbs
				;;
			restart)
				echo "Restarting PBS"
				stop_pbs
				pre_start_pbs
				;;
			*)
				echo "Usage: `basename $0` --version"
				echo "Usage: `basename $0` {start|stop|restart|status}"
				exit 1
				;;
		esac
		;;
esac