getappinfo.sh

# any valid steam appid as arg1
#!/bin/bash

AIVDF="$HOME/.local/share/Steam/appcache/appinfo.vdf"
STLAPPINFOIDDIR="$HOME/.config/stl/games/appinfo"

function getRawAppIDInfo {
	SEARCHID="$1"

	HXTST="$(printf '%x\n' "$SEARCHID" | fold -w2 | tail -n1)"
	if [ "${#HXTST}" -eq 1 ]; then
		SHEX1="$(printf '0%x\n' "$SEARCHID" | fold -w2 | tac)";
	else
		SHEX1="$(printf '%x\n' "$SEARCHID" | fold -w2 | tac)";
	fi

	unset SHEXOUT
	while read -r line; do
		SHEXOUT="$SHEXOUT\x${line}"
	done <<< "${SHEX1^^}"
	echo "SHEXOUT '$SHEXOUT'"
	#echo sed "\"s/\x61\x70\x70\x69\x64\x00${SHEXOUT}\x00\x00/APPID$1/g\"" "$AIVDF"
	sed "s/\x61\x70\x70\x69\x64\x00${SHEXOUT}\x00\x00/APPID$1/g" "$AIVDF" | strings | sed -n "/APPID$1/,/^appid/p"
}

getRawAppIDInfo "$1"