members - 20080128.1+nmu2+b1 main

members is the complement of groups: whereas groups shows the groups a
specified user belongs to, members shows users belonging to a specified
group.
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Given the name of a group, members will send a space-separated list of
member names to stdout.
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Full option parsing has been added as of this version. You can ask for
primary members, secondary members, both on one line, each on separate
lines. If no option is selected, prints all members on one line by default.