GRMSUpdater.sh

#!/bin/bash
# read the  PID's of all RMS processes into an array and then read the number of running stations into 
# array RunList so that after killing the instances we can then update RMS and then restart the stations.
# Default behaviour if called with no arguments, - capture all the running RMS processes, kill them, update RMS, then start 
# all that are configured within directory ~/source/Stations -


# we need the following in either case

PidList=( $(ps -ef|awk '/[S]tartC/ {print $2}') ) 	# create an array of the running RMS processes

# This script when run as a crontab entry runs under root's account so we need to set some variables to allow the 
# script to launch apps onto the users desktop -which it doesn't own. We also use this to build the full paths to any
# files since jobs running under cron don't inherit normal users ENV variables
# Note: this may well break if the distro used doesn't use xdm or if the user e.g. connects via xrdp....

UserDisp=($(w -h | awk '/xdm/ {print $1,$2}')) # grab the RMS username and current display number

export XAUTHORITY=/home/${UserDisp[0]}/.Xauthority
export DISPLAY=${UserDisp[1]}

# script proper...

if [[  -z "$1" ]] 					# called with no args
then
echo " ....Will restart all configured stations post-update"
	for Dir in /home/${UserDisp[0]}/source/Stations/*
		do
			if [[  "${Dir##*/}" != "Scripts" ]]
			then
			RunList+=(${Dir##*/}) # build an array of the configured stations
			fi
		done

# the next line is  a little tricksy.... when the 1st instance of lxterminal is launched, subsequent launches are in fact daughters of the 1st
# launched instance. So if for example the user opens a separate lxterminal to say perform some action but not running an RMS process, then this 
# terminal instance is in fact owned by the 1st launched lxterminal instance which might be running RMS. So we don't want to explicitly kill this root
# terminal process since it would terminate all the users terminal sessions.
# So the 1st element in array PidList is the root lxterminal instance, because process PID's are allocated in numerically ascending order
# and ps output by default is ordered by ascending PID's, so when iterating through this array we start at index 1 and not index 0 the 
# 1st array element.... 
        	for Pid in "${PidList[@]:1}"
			do
			kill $Pid
			done
		/home/${UserDisp[0]}/source/RMS/Scripts/RMS_Update.sh >/dev/null 
		sleep 10
		for Station in "${RunList[@]}"		# restart all that are configured
        	do
			sleep 15
			lxterminal --title=${Station} -e "/home/${UserDisp[0]}/source/Stations/Scripts/StartCapture.sh ${Station}" &
	 	done
else

# If called with any argument then all running RMS processes are killed and RMS updated
# however only those only those stations that were actually running when called are restarted
# and not all the stations that are configured. 
# Handy if say out of 3 stations, one is not running due to a camera issue
# grab the running station names, slightly tricky since there is only one parent lxterminal but potentially many children
	RunList=( $(ps -ef|awk  'BEGIN {FS="/"} /[S]tations/ {print $(NF-1)}' |sort -u) )

	for Pid in "${PidList[@]:1}"
		do
		kill $Pid
		done
		/home/${UserDisp[0]}/source/RMS/Scripts/RMS_Update.sh >/dev/null 
	sleep 10
	for Station in "${RunList[@]}"
		do
		echo "starting $Station"
		sleep 15
		lxterminal --title=${Station} -e "/home/${UserDisp[0]}/source/Stations/Scripts/StartCapture.sh ${Station}" &
		done
fi