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Full Discussion: Append users if GID exists
Top Forums Shell Programming and Scripting Append users if GID exists Post 302715929 by DGPickett on Monday 15th of October 2012 04:55:01 PM
Old 10-15-2012
Yes, it is nice to avoid n^2 problems at the start! Solutions with comm are very robust and scale well, can exploit multiprocessing and such well, detect both negative (missing) and positive (wrong) problems!
 

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LEARN ABOUT MINIX

group

GROUP(5)                                                     Linux Programmer's Manual                                                    GROUP(5)

NAME

       group - user group file

DESCRIPTION

       The /etc/group file is a text file that defines the groups on the system.  There is one entry per line, with the following format:

           group_name:password:GID:user_list

       The fields are as follows:

       group_name  the name of the group.

       password    the (encrypted) group password.  If this field is empty, no password is needed.

       GID         the numeric group ID.

       user_list   a list of the usernames that are members of this group, separated by commas.

FILES

       /etc/group

BUGS

       As the 4.2BSD initgroups(3) man page says: no one seems to keep /etc/group up-to-date.

SEE ALSO

       chgrp(1), gpasswd(1), groups(1), login(1), newgrp(1), sg(1), getgrent(3), getgrnam(3), gshadow(5), passwd(5)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux                                                               2016-10-08                                                            GROUP(5)
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