Remove a secondary group from user (Linux) Post: 302950947

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Top Forums UNIX for Dummies Questions & Answers Remove a secondary group from user (Linux) Post 302950947 by John K on Thursday 30th of July 2015 10:24:59 AM

07-30-2015

Registered User

Thanks Ravinder,
Using -a option in usermod, you can easily add the user to another group.In my below example, I added john to asmoper group using -a option as shown below

Code:

# useradd -u 28 -g oinstall -G asmadmin,asmdba john
#
# id -a john
uid=28(john) gid=2000(oinstall) groups=2000(oinstall),2100(asmadmin),2300(asmdba)
#
#
#
# usermod -a -G asmoper john
#
# id -a john
uid=28(john) gid=2000(oinstall) groups=2000(oinstall),2100(asmadmin),2300(asmdba),2301(asmoper)

I was hoping for a similair short command to remove just one group from a user. Using your method,I need to list all the groups I want to keep. It could be confusing if the user belongs to several groups

For eg: If I want to remove secondary group asmadmin from john user, I need to list asmoper,asmdba groups which I want to keep after -G

Code:

# id -a john
uid=28(john) gid=2000(oinstall) groups=2000(oinstall),2100(asmadmin),2300(asmdba),2301(asmoper)
#

# usermod -G asmoper,asmdba john
#
# id -a john
uid=28(john) gid=2000(oinstall) groups=2000(oinstall),2300(asmdba),2301(asmoper)

Last edited by John K; 07-30-2015 at 11:32 AM..

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LEARN ABOUT OSX

mailer

MAILER(8)						      System Manager's Manual							 MAILER(8)

NAME

       mailer - script to warn users about their weak passwords

SYNOPSIS

       mailer password-files

DESCRIPTION

       This  manual  page  documents  briefly  the mailer command, which is part of the john package.  This manual page was written for the Debian
       GNU/Linux distribution because the original program does not have a manual page.  john, better known as John the Ripper, is a tool to  find
       weak passwords of users in a server.
       The mailer tool is useful to inform users which have been found to be using weak passwords by mail.

       You  should edit the message mailer will send to the users, but remember to copy the script to a safe place before editing it, as it's gen-
       erally a bad idea to modify things living in /usr.

SEE ALSO

       john(8), unafs(8), unique(8), unshadow(8).

       The programs are documented fully by John's documentation, which should be available in /usr/share/doc/john or other location, depending on
       your system.

AUTHOR

       This manual page was written by Jordi Mallach <jordi@debian.org>, for the Debian GNU/Linux system (but may be used by others).
       John the Ripper and mailer were written by Solar Designer <solar@openwall.com>. The complete list of contributors can be found in the CRED-
       ITS file in the documentation directory.

john								   June 03, 2004							 MAILER(8)

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