How can I redirect Windows cmd standard output and standard error to a single file?

To redirect both the standard output (stdout) and standard error (stderr) from the Windows Command Prompt (cmd) to the same file, you can use redirection operators. The following steps demonstrate how to achieve this:

1. Using > to redirect standard output:

cmd
command > output.txt

This command redirects the standard output of command to the output.txt file. If the output.txt file already exists, it will be overwritten.

1. Using 2>&1 to redirect standard error to standard output:

cmd
command > output.txt 2>&1

In this command, > first redirects the standard output to output.txt, and then 2>&1 redirects the standard error to the current standard output location (i.e., the output.txt file). This ensures both standard output and standard error are written to the same file.

Example

Suppose you have a batch file test.cmd that outputs information to standard output and may generate standard error output. You can execute this batch file using the following command to record both output and errors to log.txt:

cmd
test.cmd > log.txt 2>&1

This method redirects both the standard output and standard error from test.cmd to the log.txt file. It is particularly useful for debugging and logging output in automated scripts and long-running processes.