Howto: Linux Add User To Group

How can i run the passwd command
non-interactively in linux . I want to change the password through a script file….How can i
invoke the passwd command thru a script file non-interactively.
If thats not possible then suggest
some alternative…

praj: see chpasswd(8)

I find the easiest way to add a user to a group is using gpasswd like this:
gpasswd -a

This is wrong, usermod -G ftp tony will take you out of all your existing groups. Not add a new one.

Actually, it’s easier to go like this:

usermod -a -G ftp tony

The -a causes your old groups to be kept. At least in the newer versions. I was looking into this and found an old manpage where the -a function is not documented.

Since I don’t know when this feature was introduced, you should check for it on the man pages before using it.

I recommend that when you need to add people to an existing group to use

gpasswd -a USER GROUP

thanks for -a option, it saved my time on centos

Hello,

how can I give a usergroup root rights?
I would like to create a group “developer” but they need root access as well.

thanks,
Oliver

install sudo.

then edit /etc/sudoers (or other location)

and append the line-

%developer ALL=(ALL) NOPASSWD: ALL

This will give the users in group developer the root access but will need to type

sudo

The above setup will not demand root password

See if you have backup in /etc/group- or restore it from your tape backup.

HTH

May be this will help

You need to write a shell script; there is no built in option to create mysql db.

Hi… newb here ;)
I have a quick question: in CentOS 5, when I type usermod -a -G ftp tony I always get the error “invalid numeric argument ‘ftp’ why is that?

If you modified your own user account while logged in with it, the changes will not have an effect until you next login.

If you don’t want to logout, you can replace your current BASH shell with a new one to achieve the same thing by running the follow:

su –preserve-environment –command “$(which $SHELL) –login -i” $(whoami)

This will switch-user to yourself, replacing your current shell with a new instance of itself. You will be prompted for your password.

If you don’t specify a command to run you’ll probably get an error to the effect of “cannot execute bash: file not found” because it won’t be on the environment. You could use –shell to point su at it, but your shell wouldn’t be a “login” shell and therefore won’t read your .bash_profile etc.

why do we need to add new users in linux?

WHAT IS THE COMMAND TO CHECK THE EXISTING GROUPS IN THE SYSTEM AND ALSO COMMAND TO CHECK THE USERS ???

In the past when I’ve upgraded to the latest edition of Ubuntu I’ve added any existing users by entering the user name, real name, password etc. into the Users and Groups dialogue boxes and all worked fine.

However with upgrading to Hardy when I do the same an error flags up saying “Home Directory Already Exists – Please enter a different home directory path” and I’ve been unable to re-instate the users.

Can anyone tell me how to add these users

how to add two groups in a group
for eg: group1 and group2 these group should be added to another group called group3

Hi Vivek,

your tutorial is really nice to follow.

I have a scenario, where i need to create a super user and subuser(1,2,3) for accessing ftp in our webserver it is linux with redhat on it. so that super user can access all the subuser folders, and subusers can access only their folders respectively.

I haven’t created any of the groups, so i would like to know from scratch like defining users and creating permissions.

since I am new to this linux environment, it would be great if you could post commands like the one above for the scenario i explained.

Many Thanks.
Suresh

Ive managed to add account.

richard@richard-desktop:~$ sudo useradd -G admin,dialout,cdrom,floppy,audio,dip,video,plugdev,fuse,lpadmin aksu
richard@richard-desktop:~$ sudo passwd aksu
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
richard@richard-desktop:~$ id aksu
uid=1001(aksu) gid=1001(aksu) groups=1001(aksu),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),107(fuse),109(lpadmin),115(admin)

Now I have a problem, when I connect the server says:

Could not chdir to home directory /home/aksu: No such file or directory

How can I manage that to work out right. ATM I can’t use TAB for filling in file/folder names etc.. PLZ help me out :)

i type in useradd command but i get the response command not found.what is the problem

To add a user to multiple groups – ‘man useradd’

-G, –groups GROUP1[,GROUP2,...[,GROUPN]]]
A list of supplementary groups which the user is also a member of.
Each group is separated from the next by a comma, with no intervening whitespace. The groups are subject to the same restrictions as the group given with the -g option.
The default is for the user to belong only to the initial group.

How to delete and add a group..
please help me..

Thanks

to add user in multiple group

usermod -G group1,group2 username

pliz thanx so much for your ideas but my question was how to add one user to the linux group.am waiting right now.
God bless you

If I have a user that is only used to run scripts (started by fetchmail), but I do not actually ever log in as such user in the console. I have added that user to a group to get access to a folder, but it does not seem to work.. if it was a normal user, I would simply log out and log in again to activate my membership in this group.. but since I never log in with this user, how can I make sure that it is actually a member of the group?

i got it
useradd -Ng -M

it was very helpful to usermod command to modified changes the user

Hi ,

Say i have a group called music.

I want every new user henceforth created to automatically have the music group as their secondary group on top of the primary group that will be added by the system.

Is this possible?

Thanks