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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How can I add a user to a group under Linux operating system using command line options? How to add an existing user into a group in Linux using command line options?

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