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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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Linux: Show The Groups a User Is In

How do I find out what groups I belong to under Linux operating systems?
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How do I a user to the Apache group called www-data under Ubuntu or Debian Linux server operating systems?
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Understanding /etc/passwd File Format

Can you explain /etc/passwd file format for Linux and UNIX operating systems?
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