Parallel is a shell utility to run scripts in parallel. It can take its input and start multiple processes at the same time to quickly process its input, such as a list of URLs or files. It breaks down its input into different pieces then lets each process work on a piece.
The root password is the final security barrier that protects a Linux system’s administrative account from unauthorized access. If the password is lost, it becomes impossible to administer the system and make configuration changes, so let’s look at different ways to recover it.
In Linux, most services log information about their performance in simple text file format. Versatile text processing tools exist in the shell to parse, sort and search this information.