class Etc::Group

Group is a placeholder Struct for user group database on Unix systems.

name: contains the name of the group as a String.
passwd: contains the encrypted password as a String. An 'x' is returned if password access to the group is not available; an empty string is returned if no password is needed to obtain membership of the group. This is system-dependent.
gid: contains the group’s numeric ID as an integer.
mem: is an Array of Strings containing the short login names of the members of the group.

Source

static VALUE
etc_each_group(VALUE obj)
{
    RETURN_ENUMERATOR(obj, 0, 0);
    each_group();
    return obj;
}

Iterates for each entry in the /etc/group file if a block is given.

If no block is given, returns the Enumerator.

The code block is passed a Group struct.

Example:

require 'etc'

Etc::Group.each {|g|
  puts g.name + ": " + g.mem.join(', ')
}

Etc::Group.collect {|g| g.name}
Etc::Group.select {|g| !g.mem.empty?}