Use grpusr to query which group (or groups) a user (or users) is a member of! No more nasty shellscript parsing of /etc/group and /etc/passwd! I've done it for you!
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.