Transparent fabric mod folder version switcher for Minecraft

mcverswitch.sh

#!/bin/bash
export DRI_PRIME=1
export vblank_mode=0

$DROPCACHES="$HOME/bin/drop_caches.sh"

if [ -x $DROPCACHES ];
then
  sync
  sudo $DROPCACHES
fi

sudo cpufreq-set -c 0 -g schedutil
sudo cpufreq-set -c 1 -g schedutil

OPWD=`pwd`

CMD="$@"

if [[ "$CMD" == *"JavaCheck.jar"* ]]
then
	exit 1
fi

GAMEDIR=`echo $CMD | grep -o "\\-\\-gameDir [^ ]*" | sed 's/--gameDir //'`

cd $GAMEDIR

FABVER=`echo $CMD | grep -o "\\-\\-version fabric\-loader\-\([0-9\\.\\-]\)*"`

if [[ $FABVER =~ \-\-version\ fabric\-loader\-([0-9\.]+)\-([0-9\.]+) ]]
then
  MCVER="${BASH_REMATCH[2]}"
fi

case $MCVER in
	"1.16.5")
	JVM="/opt/graalvm-ce-java11-21.1.0/bin/java"
	JOPTS=""
	;;
	*)
	JVM="/opt/graalvm-ce-java19-22.3.1/bin/java" ;
	JOPTS="-Djava.net.preferIPv6Addresses=true -XX:+EnableJVMCI -XX:+UseJVMCICompiler -Dgraal.LoopRotation=true -Dgraal.PartialUnroll=true -Dgraal.VectorizeSIMD=true -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1"
	;;
esac

MODFOLDER="$GAMEDIR/mods.$MCVER"

if [ -d "$MODFOLDER" ];
then
  rm -rf mods
  ln -s $MODFOLDER "$GAMEDIR/mods"
fi

cd $OPWD

exec obs-glcapture nice -n -16 $JVM "$@" $JOPTS

sudo cpufreq-set -c 1 -g ondemand
sudo cpufreq-set -c 0 -g ondemand