group membership

How do I find out the group name under Linux operating systems using bash shell prompt? How do I display group information for the specified USERNAME under Linux?

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How do I find out group membership for each user? How do I find out which users are in a group called sales?

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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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Can you explain me the format of /etc/group user group file under Linux / UNIX operating systems?

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