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usermod 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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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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How do I a user to the Apache group called www-data under Ubuntu or Debian Linux server operating systems?
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HowTO: Linux Disable a User Account Command

How do I disable a user account under Linux operating systems? How can I completely disable a user account Linux server?
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Ubuntu: Rename an Account [ User ID ]

How do I rename a user name from 'tom' to 'jerry' under Ubuntu Linux?
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Linux / UNIX: Restrict Access To A Given Command

How do I restrict access to a given command for instance /opt/apps/start, to authorized users only under Linux / UNIX / BSD operating system?
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I'm CentOS Linux version 5.x user and I'd like to restrict execution of /usr/sbin/userhelper to console users only in xusers group?
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