One of the simplest ways to run a command in the background is by appending an ampersand (&) at the end of the command. This method instructs the shell to execute the command as a separate background ...
While Linux systems install with thousands of commands, bash also supplies a large number of “built-ins”—commands that are not sitting in the file system as separate files, but are part of bash itself ...
Check if a file is really a file, whether a string contains anything, and whether you can run a program with these vital patterns.