useradd command

How do I automatically disable user accounts after 30 days after password expiration date under CentOS / Fedora / Red Hat / RHEL / Scientific Linux server operating systems?

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How do I add a user to group under Ubuntu Linux operating system using command line options?

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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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How do I create a user account under UNIX operating system and assign a password to user account so that he / she can login into server or UNIX workstation?

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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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