This article provides insufficient context for those unfamiliar with the subject.(May 2013)
Group is a name service database used to store group information on Unix-like operating systems. The sources for the group database (and hence the sources for groups on a system) are configured, like other name service databases, in nsswitch.conf.
Seeing available groups on a Unix systemEdit
The contents of the group database (and available groups) can be seen with a variety of tools:
The getent command can be used to fetch group information.
Fetching a list of all available groupsEdit
Fetching a specific groupEdit
For a specific group called 'users':
getent group users