Q. How can I force my Linux users to change their passwords upon the first login under CentOS / Debian Linux?
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usermod command
How do I add a user to a group under Sun Solaris UNIX operating system from a shell prompt or command line?
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Q. User tom is a member of a group called sales and printer. I’d like to remove tom from a group called printer without editing any user configuration text files stored at /etc/ directory?
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Q. How do I deny or block user login for user id tom? I’m using CentOS 5 Linux server OS. A.. You need to use passwd command. Deny user login by locking out account Pass -l option to passwd command. It is used to lock the specified account and it is available to root only. [...]
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Q. How do I change user name (rename user name) or UID under Linux operating system? A. Use the usermod command to change user name under Linux. it modifies the system account files to reflect the changes that are specified on the command line. Syntax is as follows usermod -l login-name old-name Where, => The [...]
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