Stdout

How would I redirect the standard output of a command (useradd) to a file named useradd_output.txt? How would I redirect stderr of the same useradd command to a file named useradd_errors.txt? Finally, how would I redirect both stdout and stderr of the same useradd command to useradd_all_outputs.txt?

To redirect the standard output of a command such as useradd to a file named useradd_output.txt, you can use the > operator. To redirect the standard error of the same useradd command to a file named useradd_errors.txt, you can use the 2> operator. And to redirect both the standard output and standard error of the same useradd command to a file named useradd_all_outputs.txt, you can use the &> operator. Here are the commands:

A. Redirect standard output to a file named useradd_output.txt:

$ useradd newuser > useradd_output.txt

B. Redirect standard error to a file named useradd_errors.txt:

$ useradd newuser 2> useradd_errors.txt

C. Redirect both standard output and standard error to a file named useradd_all_outputs.txt:

$ useradd newuser &> useradd_all_outputs.txt

In these examples, the useradd command adds a new user account, and the appropriate operator redirects the standard output or standard error to the specified file. If the file already exists, the output or error message will be appended to the end of the file, depending on the operator used.