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Top Forums UNIX for Dummies Questions & Answers Removing a user that doesnt exist from a group Post 302542033 by rethink on Tuesday 26th of July 2011 12:18:01 PM
Old 07-26-2011
Removing a user that doesnt exist from a group

Hi there, normally if I want to remove a user tht I have added to a specific group, i would do the following

this is what my group2 looks like

Code:
# grep group2 /etc/group
group2:x:7777:user2,user1,user4


user1 has been defined in a few groups

Code:
# id -nG user1
group1 group2 group3


So this is the situation, on a large number of boxes, some local accounts (like user1) have been removed manually from the passwd/shadow files. This subsequently does not clean up the groups that the user may have been in


As far as i understand, to remove a user from a group, I need to define (using usermod) the groups it is a member of and it will go and remove from all those that I havent defined


so to remove the user from group2, issue the command:

Code:
# usermod -G group1,group3 user1

However, because the user doesnt exist i get

id: user1: No such user


Is there any way I can use a utility to clean this up or will I have to hack the file ?

any help would be greatly appreciated
 

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GPASSWD(1)						      General Commands Manual							GPASSWD(1)

NAME
gpasswd - administer the /etc/group file SYNOPSIS
gpasswd group gpasswd -a user group gpasswd -d user group gpasswd -R group gpasswd -r group gpasswd [-A user,...] [-M user,...] group DESCRIPTION
gpasswd is used to administer the /etc/group file (and /etc/gshadow file if compiled with SHADOWGRP defined). Every group can have adminis- trators, members and a password. System administrator can use -A option to define group administrator(s) and -M option to define members and has all rights of group administrators and members. Group administrator can add and delete users using -a and -d options respectively. Administrators can use -r option to remove group pass- word. When no password is set only group members can use newgrp(1) to join the group. Option -R disables access to the group through new- grp(1) command. gpasswd called by a group administrator with group name only prompts for the group password. If password is set the members can still new- grp(1) without a password, non-members must supply the password. FILES
/etc/group - group information /etc/gshadow - shadow group information SEE ALSO
newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8) AUTHOR
Rafal Maszkowski <rzm@pdi.net> GPASSWD(1)
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