Newer mod files, are confusing

Recently myself and a few friends are coming back to ftb, so i wanted to host a server again. I have hosted a few in the past so im fairly familiar with it. We are using (Ultimate reloaded v1.9.0; minecraft 1.12.2) Really the only trouble im running into is changing the amount of ran i have dedicated into the server. Okay so old serverstart.sh files all i had to do is look for ""java -Xms512M -Xmx1G"" and i could change the values, easy enough right? The new files--

-------------------------------------------------------------
#!/bin/sh

# Fix work directory
# Some GUIs set wrong working directory which breaks relative paths
cd -- "$(dirname "$0")"

# makes things easier if script needs debugging
if [ x${FTB_VERBOSE} = xyes ]; then
set -x
fi

# Read pack related settings from external setting file
. ./settings.sh

# Read settings defined by local server admin
if [ -f settings-local.sh ]; then
. ./settings-local.sh
fi

# cleaner code
eula_false() {
grep -q 'eula=false' eula.txt
return $?
}

# cleaner code 2
start_server() {
"$JAVACMD" -server -Xmx${MAX_RAM} ${JAVA_PARAMETERS} -jar ${FORGEJAR} nogui
}

# run install script if MC server or launchwrapper s missing
if [ ! -f ${JARFILE} -o ! -f libraries/${LAUNCHWRAPPER} ]; then
echo "Missing required jars. Running install script!"
sh ./FTBInstall.sh
fi

# check eula.txt
if [ -f eula.txt ] && eula_false ; then
echo "Make sure to read eula.txt before playing!"
echo "To exit press <enter>"
read ignored
exit
fi

# if eula.txt is missing inform user and start MC to create eula.txt
if [ ! -f eula.txt ]; then
echo "Missing eula.txt. Startup will fail and eula.txt will be created"
echo "Make sure to read eula.txt before playing!"
echo "To continue press <enter>"
read ignored
fi

echo "Starting server"
rm -f autostart.stamp
start_server

while [ -e autostart.stamp ] ; do
rm -f autostart.stamp
echo "If you want to completely stop the server process now, press Ctrl+C before the time is up!"
for i in 5 4 3 2 1; do
echo "Restarting server in $i"
sleep 1
done
echo "Rebooting now!"
start_server
echo "Server process finished"
done

---------------------------------------
So this is what im looking at, while pasting it in here its slightly more readable, but other wise i honestly am really confused what i am suppose to be doing, and how to go about changing the server ram. Currently we are unable to play until i can change it, due to 256mb only being enough to start the server.
Any help would be appreciated. All and all i understand changing all the other server features, from past experiences, but the new stuff doesnt make sense to me.

 

check settings.sh (or settings.bat for windows)

 

rem Do not touch
set MCVER=1.12.2
set JARFILE=minecraft_server.%MCVER%.jar
set LAUNCHWRAPPERVERSION=1.12
set LAUNCHWRAPPER=net\minecraft\launchwrapper\%LAUNCHWRAPPERVERSION%\launchwrapper-%LAUNCHWRAPPERVERSION%.jar
set FORGEJAR=FTBserver-1.12.2-14.23.5.2846-universal.jar

rem can be changed by user
set MAX_RAM=2048M
set JAVA_PARAMETERS=-XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled -XXarallelGCThreads=5 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10

is the setting.bat

It keeps listing "max ram 2048" by default but its not using that, and i cant see anything to adjust it.

 

Change
set MAX_RAM=2048M

to something else, example:
set MAX_RAM=4096M
for 4gb etc.

And then save the file.

 

Alright thanks, ill give it a try and see how it goes. Really want to try some of the new packs with my friends