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How can I redirect both stderr and stdin at once?

Posted on July 31, 2022 by David Darling

Table of Contents

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  • How can I redirect both stderr and stdin at once?
  • How do I redirect to stderr?
  • What is the difference between $@ and $*?
  • Does Tee redirect stderr?
  • What does stderr mean?
  • What is |& in bash?

How can I redirect both stderr and stdin at once?

2> is input redirection symbol and syntax is:

  1. To redirect stderr (standard error) to a file: command 2> errors.txt.
  2. Let us redirect both stderr and stdout (standard output): command &> output.txt.
  3. Finally, we can redirect stdout to a file named myoutput.txt, and then redirect stderr to stdout using 2>&1 (errors.txt):

How do I redirect to stderr?

The regular output is sent to Standard Out (STDOUT) and the error messages are sent to Standard Error (STDERR). When you redirect console output using the > symbol, you are only redirecting STDOUT. In order to redirect STDERR, you have to specify 2> for the redirection symbol.

How would you redirect a command stderr to stdout?

Understanding the concept of redirections and file descriptors is very important when working on the command line. To redirect stderr and stdout , use the 2>&1 or &> constructs.

What is the difference between $@ and $*?

$* – is all arguments are double quoted. $@ – is all arguments are individually double quoted.

Does Tee redirect stderr?

In effect, the standard error (as standard input) is passed to tee where it logs to stderr. log and also redirects to file descriptor 3.

How do I redirect stderr to null?

How do I redirect the output of stderr to stdout, and then redirect this combined output to /dev/null device? In Unix, how do I redirect error messages to /dev/null? You can send output to /dev/null, by using command >/dev/null syntax.

What does stderr mean?

standard error
Stderr, also known as standard error, is the default file descriptor where a process can write error messages. In Unix-like operating systems, such as Linux, macOS X, and BSD, stderr is defined by the POSIX standard. Its default file descriptor number is 2.

What is |& in bash?

Bash Pipelines Using |& |& connects standard output and standard error of the first command to the second one while | only connects standard output of the first command to the second command.

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