06-17-2010
The primary group is set in /etc/passwd. When a new file is created by a user, the group owner is the primary group by default. Secondary groups memberships are set in /etc/group. The primary group can be changed temporarily with the command "newgrp"
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LEARN ABOUT DEBIAN
members
MEMBERS(1) General Commands Manual MEMBERS(1)
NAME
members - outputs members of a group
SYNOPSIS
members groupname
DESCRIPTION
This manual page documents briefly the members commands. This manual page was written for the Debian GNU/Linux distribution.
members is a program that sends a space-separated list of secondary member names to its standard output.
OPTIONS
The programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included
below.
-a, --all
Show all group members on one line. This is the default.
-p, --primary
Show only primary group members.
-s, --secondary
Show only secondary group members.
-t, --two-lines
Send two lines to standard output. First line is primary members, second line is secondary members. NOTE: This always displays two
lines, even if there are no members at all.
-h, --help
Show summary of options.
DIAGNOSTICS
Exit status is 0 (i.e. "success") if the group was found, and 1 (i.e., "failure") if the group was not found.
Technically, the exit status hinges on the output of getgrnam(3) as follows: if getgrnam(3) returns a null pointer, the exit status is 1,
and 0 otherwise.
BUGS
I don't know of any! If you find one, please let me know!
SEE ALSO
groups(1)
AUTHOR
This manual page was written by Jim Lynch <jim@laney.edu>, for the Debian GNU/Linux system (but may be used by others).
MEMBERS(1)