What does `2>&1` mean?

The 2>&1 syntax is used in Unix-like operating systems to redirect error messages to the same location as standard output. Here's a breakdown of what it means:

  • 2 refers to the standard error (stderr) file descriptor.
  • 1 refers to the standard output (stdout) file descriptor.
  • > is the redirection operator.

So, 2>&1 means "redirect standard error (2) to the same place as standard output (1)." This is often used in command-line operations to capture both output and error messages in the same stream, which can be useful for logging or debugging purposes.

For example, if you run a command like this:

command > output.txt 2>&1

It will redirect both the standard output and standard error of command to output.txt.

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