update to moxanix script, added status command

moxanix.sh

@@ -3,51 +3,171 @@
 # Main script for controlling servers.
 
 
+# Call: usage
+# Shows help.
 usage ()
 {
-echo "Usage: ./$(basename $0) COMMAND ID"
-echo "	COMMAND: start, stop"
-echo "	ID: 1-7"
+	echo "Usage: ./$(basename $0) <command> <id>..."
+	echo "	<command>"
+	echo "		start	- starts server identified by <id>"
+	echo "		stop	- stops server identified by <id>"
+	echo "		status	- displays status for server identified by <id>"
+	echo "	<id>"
+	echo "		number 1-7 for specific server, 0 for all servers"
+	echo
+}
+
+# Call: start ID
+# Starts specific server with output redirected to a logfile.
+start ()
+{
+	# grab parameters
+	ID=$1
+	
+	# set variables
+	TCP_PORT=$((4000 + $ID))
+	TTY_PATH="/dev/ttyS$ID"
+	
+	# check if requested server is already up
+	pid=$(ps axf | grep "[m]oxerver -p $TCP_PORT" | awk '{print $1}')
+	if [ "$pid" != "" ]; then
+		echo "server $ID is already up"
+		return 0
+	fi
+	
+	SERVER_RUN="./moxerver"
+	
+	LOGDIR="./logs"
+	LOGFILE="$LOGDIR/moxerver$ID.log"
+
+	# create log directory if it doesn't exist
+	if [ ! -d $LOGDIR ]; then
+		mkdir -p $LOGDIR
+	fi
+	
+	# start server, redirect stdout and stderr to logfile
+	# nohup keeps it running when the script ends
+	nohup $SERVER_RUN -p $TCP_PORT -t $TTY_PATH > $LOGFILE 2>&1 &
+	echo "server $ID started"
+}
+
+# Call: stop ID
+# Stops specific server.
+stop ()
+{
+	# grab parameters
+	ID=$1
+	
+	# set variables
+	TCP_PORT=$((4000 + $ID))
+	
+	# check if requested server is already down
+	pid=$(ps axf | grep "[m]oxerver -p $TCP_PORT" | awk '{print $1}')
+	if [ "$pid" = "" ]; then
+		echo "server $ID is already down"
+		return 0
+	fi
+	
+	# kill requested server
+	kill -s SIGTERM $pid
+	echo "server $ID stopped"
+}
+
+# Call: status ID
+# Displays if specific server is running or not.
+status ()
+{
+	# grab parameters
+	ID=$1
+	
+	# set variables
+	TCP_PORT=$((4000 + $ID))
+	
+	# check if requested server is up or down
+	pid=$(ps axf | grep "[m]oxerver -p $TCP_PORT" | awk '{print $1}')
+	if [ "$pid" = "" ]; then
+		echo "server $ID is down"
+	else
+		echo "server $ID is up"
+	fi
 }
 
 ##########
 
 # check parameter count
-if [ $# != 2 ]; then
+if [ $# -lt 1 ]; then
 	usage
 	exit
 fi
 
-# grab parameters
+# grab parameter - command
 COMMAND=$1
-ID=$2
 
-# set variables
-TCP_PORT=$((4000 + $ID))
-TTY_PATH="/dev/ttyS$ID"
-
-LOGDIR="./logs"
-LOGFILE="$LOGDIR/moxerver$ID.log"
-
-# execute commands
 if [ "$COMMAND" = "start" ]; then
-	# create log directory if it doesn't exist
-	if [ ! -d $LOGDIR ]; then
-		mkdir -p $LOGDIR
+	if [ $# -ne 2 ]; then
+		usage
+		exit
+	fi
+	# grab parameter - id
+	ID=$2
+	# if ID is 1-7 run command for specific server
+	if [ $ID -ge 1 ]  && [ $ID -le 7 ]; then
+		start $ID
+	# if ID is 0 run command for all servers
+	elif [ $ID -eq 0 ]; then
+		for NUM in {1..7}
+		do
+		start $NUM
+		done
+	# wrong ID value
+	else
+		usage
+		exit
 	fi
-	# start moxerver, redirect stdout and stderr to logfile
-	# nohup keeps it running when the script ends
-	nohup ./moxerver -p $TCP_PORT -t $TTY_PATH > $LOGFILE 2>&1 &
 	
 elif [ "$COMMAND" = "stop" ]; then
-	# ps axf 				-> list all processes with PID as first field
-	# grep [m]oxerver...	-> [] trick eliminates the actual grep process from results
-	# awk '{print $1}' 		-> print the first field from the line, in this case PID
-	pid=$(ps axf | grep "[m]oxerver -p $TCP_PORT" | awk '{print $1}')
-	if [ $pid = "" ]; then
-		echo "nothing to kill"
+	if [ $# -ne 2 ]; then
+		usage
+		exit
+	fi
+	# grab parameter - id
+	ID=$2
+	# if ID is 1-7 run command for specific server
+	if [ $ID -ge 1 ]  && [ $ID -le 7 ]; then
+		stop $ID
+	# if ID is 0 run command for all servers
+	elif [ $ID -eq 0 ]; then
+		for NUM in {1..7}
+		do
+		stop $NUM
+		done
+	# wrong ID value
+	else
+		usage
+		exit
+	fi
+	
+elif [ "$COMMAND" = "status" ]; then
+	if [ $# -ne 2 ]; then
+		usage
+		exit
+	fi
+	# grab parameter - id
+	ID=$2
+	# if ID is 1-7 run command for specific server
+	if [ $ID -ge 1 ]  && [ $ID -le 7 ]; then
+		status $ID
+	# if ID is 0 run command for all servers
+	elif [ $ID -eq 0 ]; then
+		for NUM in {1..7}
+		do
+		status $NUM
+		done
+	# wrong ID value
+	else
+		usage
+		exit
 	fi
-	kill -s SIGTERM $pid
 	
 else
 	# unsupported command