Quick Tip

The Power of `2>&1`: Unified Log Redirection

Challenge: When debugging shell scripts or monitoring complex command pipelines, you often have critical error messages going to standard error (stderr) while normal output goes to standard output (stdout). It’s inconvenient to monitor two separate streams.

The Solution: Redirect stderr to stdout, effectively merging both into a single stream.

command > output.log 2>&1

Why it works: The `> output.log` redirects stdout to a file. The `2>&1` then redirects file descriptor 2 (stderr) to the same destination as file descriptor 1 (stdout), which is already pointed to `output.log`.

Pro-Tip: Use `>&1` without a filename to redirect both stdout and stderr to the terminal if you want to see them together live.

Linux Tips & Tricks | © ngelinux.com | 5/5/2026