How do I redirect stderr and stdout to different files?
To redirect stderr as well, you have a few choices:
- Redirect stdout to one file and stderr to another file: command > out 2>error.
- Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): command >out 2>&1.
What happens if I first redirect stdout to a file and then redirect stderr to the same file?
When you redirect both standard output and standard error to the same file, you may get some unexpected results. This is due to the fact that STDOUT is a buffered stream while STDERR is always unbuffered.
Which is the correct command to redirect standard error and output to different files in UNIX?
2> is input redirection symbol and syntax is:
- To redirect stderr (standard error) to a file: command 2> errors.txt.
- Let us redirect both stderr and stdout (standard output): command &> output.txt.
- Finally, we can redirect stdout to a file named myoutput.txt, and then redirect stderr to stdout using 2>&1 (errors.txt):
Which of the following command would redirect the stdout and stderr to a single file?
7 Answers. The syntax 2>&1 will redirect 2 (stderr) to 1 (stdout). You can also hide messages by redirecting to NUL , more explanation and examples on MSDN.
When working in the bash shell you need to redirect both stdout and stderr Which of the following commands will redirect both stdout and stderr?
Conclusion
| Operator | Description |
|---|---|
| command>filename | Redirect stdout to file “filename.” |
| command>>filename | Redirect and append stdout to file “filename.” |
| command 2>filename | Redirect stderr to file “filename.” |
| command 2>>filename | Redirect and append stderr to file “filename.” |
What does &> mean in bash?
This is the same as &> . From the bash manpage: Redirecting Standard Output and Standard Error This construct allows both the standard output (file descriptor 1) and the standard error output (file descriptor 2) to be redirected to the file whose name is the expansion of word.
What is stdout and stderr?
In computer programming, standard streams are interconnected input and output communication channels between a computer program and its environment when it begins execution. The three input/output (I/O) connections are called standard input (stdin), standard output (stdout) and standard error (stderr).
Which of the following is used to redirect stderr stdout?
2>&1
You can use &[FILE_DESCRIPTOR] to reference a file descriptor value; Using 2>&1 will redirect stderr to whatever value is set to stdout (and 1>&2 will do the opposite).