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Linux Change Password

How do I change my own password as well as the passwords of other users as required under Linux operating system without using GUI systems? How can I change or set user password on Linux operating systems?
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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 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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How To: UNIX Add A User To A Group

Q. 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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Understanding /etc/shadow file

Can you explain /etc/shadow file format used under Linux or UNIX-like system?
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Understanding /etc/passwd File Format

Can you explain /etc/passwd file format for Linux and UNIX operating systems?
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