![]() Now, what is special about STDERR? To demonstrate, I will introduce an error condition to the previous example with ls file* non-existing-file* > my_normal_output.txt:ĭownload now 4. ![]() I can prove this by running the sdiff command to show the output of both commands side by side: $ls file* 1> my_other_stdout.txtĪs you can see, both outputs have the same content. If I omit the file descriptor, STDOUT is used by default. Redirecting using the > signal is the same as using 1> to do so: I'm telling the shell to redirect the STDOUT to that file. ![]() Next, I run a similar command, but with a 1 before >. I can redirect the standard output to a file using ls file* > my_stdout.txt: $ls file* > my_stdout.txt STDERR, but the same principle applies to most of the commands you execute from a shell. I'm running a simple ls commands to illustrate STDOUT vs. Redirect STDOUTįor the following examples, I will use this simple set of files: $ls -la file* There are multiple ways to redirect output from shell scripts and commands. A file descriptor is a unique identifier for a file or other I/O resource. In terms of input, STDIN by default reads input from the keyboard (file descriptor 0). STDERR: The error output from a command/script (file descriptor 2)īy default, STDOUT and STDERR are sent to your terminal's screen.STDOUT: The normal output from a command/script (file descriptor 1).Types of outputĬommands and scripts in a shell can generate two basic types of outputs: This article focuses on command and script output. Learning path: Deploy a cluster in Red Hat OpenShift Service on AWS (ROSA).Get a Red Hat Learning Subscription trial.Learn about Red Hat Certified System Administrator (RHCSA) certification.Explore Red Hat training and certification options.
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