[Level: Beginner Administrator] In the "Understanding Linux" series, we're now going to delve into some theoretical material that might seem a bit complex, especially since it involves abstract layers. But to understand Linux, we need to delve into it. YOU MUST UNDERSTAND THESE CONCEPTS. We'll be talking about system processes and, more specifically, File Descriptors (FDs), which are the data streams of applications. We'll discuss Standard Input (STDIN), Standard Output (STDOUT), Standard Error (STDERR), and how these streams are redirected to and from files. We'll also discuss the pipe mechanism, which uses these data streams to allow applications to communicate with each other. It might seem like a lot of material, but we'll look at several very simple examples to familiarize ourselves with these concepts. Let's go! Understanding Linux: EP0003 - File Descriptors, stdin, stdout, stderr, redirections, pipes explained Highlights: 00:00 Linux File Descriptors, STDIN, STDOUT, STDERR, redirections, pipes 00:59 Let's talk about processes 02:18 Let's talk about File Descriptors 02:42 System limits for user resources 03:27 Important to remember: STDIN, STDOUT, STDERR 04:12 Standard Input (STDIN) 04:37 Standard Output (STDOUT) 05:23 Standard Error (STDERR) 06:11 What is the point of all this theory? 08:13 The output redirection operator '⧽' 09:06 Concatenate the contents of files and print it 10:16 Recall, edit and execute previous commands on the shell 11:47 The asterisk '*' character acts as a wildcard on the shell 12:20 Sort lines of text files 12:58 Sort lines of text files in reverse order 13:37 Print lines that match a pattern 16:05 What is a 'pipe' '|' ? 19:15 The double output redirection operator '⧽⧽' 21:45 The input redirection operator '⧼' 26:04 Standard Input (STDIN) on multiple lines '⧼⧼' 29:09 Conclusion New commands on the shell: top ulimit cat sort grep JayDee en FRANÇAIS: @UCSs7P3ZmOy4G6X_ygavsjzQ