output replay

In shell scripting and command line usage, mastering redirection can significantly expand the functionality and efficiency of your scripts. Today, we're discussing a more advanced topic: temporarily redirecting output to a file descriptor and how you can replay or use this data later in your script. Q1: What is a file descriptor in Linux? A1: In Linux, a file descriptor is essentially a pointer that keeps track of a file (or other data stream) being accessed. By default, there are three primary file descriptors: 0 (standard input), 1 (standard output), and 2 (standard error). Scripts and commands can create additional file descriptors beyond these for various purposes.