Script to check how many people in a group have the game?

I don't know about a script, but there are some online pages that let you check the ownership of a game in a group ^^
http://swl.mabako.net/!/check

That site does work but it's very temperamental and doesn't work if you go directly to the link Samusx posted.

But if you go to http://swl.mabako.net/ and then log in with Steam it should then show a list of all groups you are a member of and you can then enter a game name and click 'Check' at the bottom.

This one still works > https://www.steamgifts.com/discussion/HipoH/

Gaffi's script (cited above) is the most complete one as far as I know.

Mabako's site is no longer fully functional, so there are only a few things you can do with it. One thing you can still do is to enter the name of a game, then select one of your groups, and it will check to see how many people in your group own that game. (It takes a while to count.)