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 ).

I am a new Unix user at my university/school. In Unix, how do I change my password to safeguard and increase the security of my Unix account?

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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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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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