Users & Groups Management HowTos

Learn all about users and groups on Linux and Unix like operating systems. Topic include user & group creations, permissions & ownership, access control, ACL, and more ( rss feed ).

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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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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How do I change user password using a shell script under FreeBSD operating systems?

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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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