How to remove a user from a group?

mangesh_ram · 03-24-2013, 04:48 AM

what is the command for del user from group

linosaurusroot · 03-24-2013, 04:54 AM

groupmod -R someone

spiky0011 · 03-24-2013, 04:54 AM

Hi

Look up usermod

DinoFly · 03-24-2013, 04:55 AM

There are different ways of removing users from a group.

Command usermod
Using option -g, --gid GROUP will set the primary group of user to "groupname",
Using option -G, --groups GROUP1[,GROUP2,...[,GROUPN]]] it will put suplementary groups to the user, if the user is currently a member of a group which is not listed, the user will be removed from the group.

or simply by editing the file: /etc/group which specifies the groups and its users

cbtshare · 03-24-2013, 06:26 AM

you can simply

Quote:

#usermod -G group username

e , and that will make the person be in two groups only,his own private group and the group you just specified.If there are more than just two groups then use the -a command and list the groups you want the person to ONLY be in.

Quote:

#usermod -a -G group1,group2,group3,group4 username

shivaa · 03-24-2013, 07:00 AM

Quote:

Originally Posted by cbtshare

you can simply

Code:

#usermod -G group username

e , and that will make the person be in two groups only,his own private group and the group you just specified.If there are more than just two groups then use the -a command and list the groups you want the person to ONLY be in.

It will remove all groups for the user, except the one specified in the command. Its not a good option, becuase user may have many other important secondary groups.

So, instead use deluser command as:

Code:

~# deluser <username> <groupname>
OR
~$ sudo deluser <username> <groupname>

fpmurphy · 03-24-2013, 09:43 AM

Simplest way is to directly edit the /etc/group file.

shivaa · 03-24-2013, 10:59 AM

Quote:

Originally Posted by fpmurphy

Simplest way is to directly edit the /etc/group file.

No. It's not at all recommended to edit configuration files directly when you have an option of direct commands to do this.

@mangesh_ram:
Don't directly edit the config. file. You have certain commands to edit the groups of a user, so simply use those command.

DinoFly · 03-24-2013, 01:19 PM

Quote:

Originally Posted by shivaa

No. It's not at all recommended to edit configuration files directly when you have an option of direct commands to do this.

@mangesh_ram:
Don't directly edit the config. file. You have certain commands to edit the groups of a user, so simply use those command.

I wonder why you say so? Does the system keep track of users in groups in other files or it is only /etc/group file? If it is only file that keeps track of those supplementary groups than it is no harm if you edit it, but sure edit it correctly, because if I am not mistaken the commands do exactly that. Sure I am speaking of local users and local groups not for AAA through network.

Please correct me if I am wrong.

shivaa · 03-24-2013, 01:23 PM

@DinoFly:
You are right, there's no harm if file is edited correctly. But there're chances of mistakes, and why one should edit the file directly when he has commands to do so? Commands were created for this purpose and we should stick to commands.

cbtshare · 03-24-2013, 03:08 PM

Quote:

Originally Posted by shivaa

It will remove all groups for the user, except the one specified in the command. Its not a good option, becuase user may have many other important secondary groups.

I dont think you took the time to read my post in its entirety,feel free to do so at your convenience.