xash launch script with logcat

#!/system/bin/sh
VARS=
MODARGS=
USER=0
ARGS=
LOGCAT=
while [ -n "$1" ]; do
case $1 in
*=*) VARS=$VARS$(echo $1|cut -d\= -f1),$(echo $1|cut -d= -f2),;shift 1 ;;
-e) MODARGS="$MODARGS -e $2";shift 2;;
-m) MODARGS="$MODARGS -e gamelibdir /data/data/in.celest.xash3d.$2/lib"; shift 2;;
-h) echo Usage: startxash [-m modname] [-g gamedir] [ENV1=VALUE1] [args]; exit 0 ;;
-g) MODARGS="$MODARGS -e gamedir $2";shift 2;;
-u) USER=$2;shift 2;;
-l) LOGCAT=1;su 0 "logcat -G64k;logcat -c";shift 1;;
-log) LOG=1;ARGS="$ARGS$1 ";shift 1;;
*) ARGS="$ARGS$1 ";shift 1 ;;
esac
done

am start --user $USER -a in.celest.xash3d.START -n in.celest.xash3d.hl.test/in.celest.xash3d.XashActivity  -e argv "$ARGS" --esa env "$VARS" $MODARGS
if [ -n "$LOGCAT" ]; then PID=0;su 0 logcat |while read line;do
case $line in
*Start\ proc\ *in.celest.xash3d.hl.test*) PID=$(echo $line|cut -d ' ' -f5|cut -d: -f1) ;;
*\(pid\ $PID\)\ has\ died*) su 0 killall logcat;echo end;;
*\(*$PID*\)*) echo "$line";;
?/DEBUG*) echo "$line";;
?/AndroidRuntime*) echo "$line";;
*) ;;
esac
done;
elif [ -n $LOG ]; then
tail -f /sdcard/.hl/engine.log
fi