The Art of Unix Programming by Eric Raymond is a book about the history and culture of Unix programming from its earliest days in 1969 to now, covering both genetic derivations such as BSD and conceptual ones such as Linux.
You should read this book if you are an experienced Unix programmer who is often in [...]
For security, reason it is necessary to disable all account(s) with no password and lock them down. Solaris, Linux and FreeBSD provide account locking (unlocking) facility.
Lock Linux user account with the following command:
passwd -l {user-name}
For unlocking the account use:
passwd -u {user-name}
-l : This option disables an account by changing the [...]
