07-31-2012
For the GID translation I simply "getent group | cut -d: -f1,3 > groups" and then I grep the GID in the groups file. It has to be this way due to circumstances beyond my control.
The output file could possibly be amended with the entries of the group upload file (sorry for the "file" terminologies). I don't see any reason why that would be a problem but if it was I could easily find a delimiter and cut them back into separate files. I think it would be ideal for them to be separate files because the system accepting group modifications in bulk will only accept input in the manner I have specified (group:x:gid:user1,user2,user3,<etc>). It would be the same format without any users however I don't believe any grep of the GID's in the user file would not return a result. But it's ok if there's an entry that's just: group:x:gid:
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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)