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What does " 2>&1 " mean?

🔍 What does "2>&1" mean?
2>&1 is a Unix-based command that redirects both standard output and standard error to a single output stream, allowing for more streamlined logging and error handling, making it a valuable tool for improving code debugging and system administration. Its practical value lies in simplifying error tracking and management, saving time and increasing productivity.

11:05 pm, February 26, 2026

guid

https://news.ycombinator.com/item?id=47171233

source_url

https://stackoverflow.com/questions/818255/what-does-21-mean

author_name

alexmolas

id: 175
uid: G4VMu
insdate: 2026-02-26 23:05:04
title: What does " 2>&1 " mean?
additional: 🔍 What does "2>&1" mean?
2>&1 is a Unix-based command that redirects both standard output and standard error to a single output stream, allowing for more streamlined logging and error handling, making it a valuable tool for improving code debugging and system administration. Its practical value lies in simplifying error tracking and management, saving time and increasing productivity.
category: Hacker News
md5:
guid: https://news.ycombinator.com/item?id=47171233
source_url: https://stackoverflow.com/questions/818255/what-does-21-mean
updated:
image:
author_name: alexmolas
author_link:
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