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Full Discussion: Remove and block a user from Linux server
Top Forums UNIX for Advanced & Expert Users Remove and block a user from Linux server Post 302210759 by Smiling Dragon on Tuesday 1st of July 2008 10:54:45 PM
Old 07-01-2008
Quote:
Originally Posted by sureshcisco
I used the above command to add a user "john". How do I delete and block john.
On many systems:
Code:
userdel john

If you want to remove the homedir also, use the -r flag.
Alternativly, to just block access without removing the account, edit /etc/shadow and change the password to *LK* to lock the account.
If userdel isn't available, you can manually remove the entires from /etc/passwd and /etc/shadow. Then just check /etc/group and remove their name, and delete their home directory.
 

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LEARN ABOUT XFREE86

userdel

userdel(1M)                                               System Administration Commands                                               userdel(1M)

NAME

       userdel - delete a user's login from the system

SYNOPSIS

       userdel [-r] login

DESCRIPTION

       The  userdel  utility  deletes a user account from the system and makes the appropriate account-related changes to the system file and file
       system.

OPTIONS

       The following options are supported:

       -r       Remove the user's home directory from the system. This directory must exist. The files and directories under  the  home  directory
                will no longer be accessible following successful execution of the command.

OPERANDS

       The following operands are supported:

       login    An existing login name to be deleted.

EXIT STATUS

       The following exit values are returned:

       0        Successful completion.

       2        Invalid command syntax. A usage message for the userdel command is displayed.

       6        The account to be removed does not exist.

       8        The account to be removed is in use.

       10       Cannot update the /etc/group or /etc/user_attr file but the login is removed from the /etc/passwd file.

       12       Cannot remove or otherwise modify the home directory.

FILES

       /etc/passwd             system password file

       /etc/shadow             system file contain users' encrypted passwords and related information

       /etc/group              system file containing group definitions

       /etc/user_attr          system file containing additional user attributes

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       auths(1),  passwd(1),  profiles(1),  roles(1),  users(1B),  groupadd(1M), groupdel(1M), groupmod(1M), logins(1M), roleadd(1M), rolemod(1M),
       useradd(1M), userdel(1M), usermod(1M), passwd(4), prof_attr(4), user_attr(4), attributes(5)

NOTES

       The userdel utility only deletes an account definition that is in the local /etc/group, /etc/passwd, /etc/shadow, and /etc/user_attr  file.
       file. If a network name service such as NIS or NIS+ is being used to supplement the local /etc/passwd file with additional entries, userdel
       cannot change information supplied by the network name service.

SunOS 5.10                                                          8 Sep 1999                                                         userdel(1M)
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