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User Management

HowTo: Change Password of Specific User Account In Linux

Hdo I change passwords for specific user account under Linux operating system using the command line?
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Ubuntu Linux: Find Groups A User Belongs To

How do I find out in which groups Ubuntu Linux users belong to? How do I find out Ubuntu Linux group membership for a particular user named tom?
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Linux: Delete / Remove User Account

How do I remove a user’s access from my server? How do I delete a user account under Linux operating systems include home directory and running cron jobs?
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Mac OS X Display Access Warnings Message For The Login Window

I know how to display notice of a computer’s ownership, to warn against unauthorized access, under Linux gnome desktop. How do I display similar message under Apple Mac OS X to remind authorized users of their consent to monitoring?
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Linux Upgrade Password Hashing Algorithm to SHA-512

The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?
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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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CentOS / Red Hat: Sudo Allows People In Group Admin To Run All Commands

I like the way Ubuntu Linux works – all people in admin groups should able to run all commands after running it via sudo “command-name”. How do I setup sudo under CentOS or Red Hat Enterprise Linux to allow all members of the ‘admin’ group to run all commands?
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FreeBSD Change User Password Shell Script

How do I change user password using a shell script under FreeBSD operating systems?
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Linux Display Date And Time Of Login

How do I display user last login date and time under Linux operating systems?
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Linux Restrict Execution of /usr/sbin/userhelper to Console Users

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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