/etc/group

• Each Group (except default Groups) should have a line in this file.
• (Yet, one can create Files belonging to Groups not found in this file).
• A line in this file is split into fields using the ':' character:
  • Group Name
  • Password/Password's Location (normally not used, and containing an 'x').
  • Group ID (number)
  • List of Users, separated by a ',' (comma) character.

Originally written by guy keren