Quick Tip

Redirecting `stderr` to `stdout` for Unified Logging

Challenge: When debugging scripts or monitoring system processes, you often have error messages (stderr) and normal output (stdout) going to different places, making it hard to see everything in one view.

The Solution: Use the `2>&1` redirection operator to merge standard error into standard output.

your_command 2>&1 | tee output.log

Why it works: In Linux, file descriptor 1 is stdout and file descriptor 2 is stderr. The `2>&1` syntax tells the shell to send anything written to stderr (2) to the same place as stdout (1). Piping to `tee` then allows you to see this combined output on your terminal while also saving it to a file.

Pro-Tip: You can use this trick with any command to simplify log analysis. For example, `dmesg 2>&1 | less` will let you scroll through kernel messages and errors together.

Linux Tips & Tricks | © ngelinux.com | 5/3/2026