I get lots of e-bills (utility, telephone, Internet, mobile, cable and so on) in a PDF format for my small business and I need to forward those to my accountant. However, all PDFs files are password protected. I don’t want to share my account password with anyone to just open my bills. Evince is a PDF document viewer capable of displaying password protected files but it cannot remove the password. How do I remove a password from all PDFs under Ubuntu or any other Linux distribution in a batch mode?
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?
Q. How can I force my Linux users to change their passwords upon the first login under CentOS / Debian Linux?
How do I change default ksh shell to bash shell under Solaris / OpenSolaris UNIX operating system using command line options?
Q. Can you tell me more about unshadow and john command line tools? How does it protect my server from crackers?
Q. How do I use htpasswd command to store username and passwords?
A. htpasswd is used to create and update the flat-files used to store usernames and password for basic authentication of HTTP users. If htpasswd cannot access a file, such as not being [...]
Q. How do I telnet as the root user?
