ow 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?
How do I rename a user name from ‘tom’ to ‘jerry’ under Ubuntu Linux?
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?
How do I add a user to a group under Sun Solaris UNIX operating system from a shell prompt or command line?
Q. Can you explain /etc/shadow file used under Linux or UNIX?
Q. Can you explain /etc/passwd file format for Linux and UNIX operating systems?