How do I redirect stderr and stdout to a file in Windows?
In order to redirect STDERR you have to specify “2>” for the redirection symbol. This selects the second output stream which is STDERR. Here the 2>&1 instructs that the STDERR to be redirected to STDOUT which is in-turn writing out to alloutput. log file.
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.
How do I redirect output to a file in Windows?
Redirect Standard Error To a File The same way you can redirect standard output writes to a file, you can also output the standard error stream to a file. To do this, you’ll need to add 2> to the end of the command, followed by the output error file you want to create. This sends the standard output stream to myoutput.
How do I redirect 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. This selects the second output stream that is STDERR.
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).
How do I redirect stdout and stderr to a file in bash?
Bash executes the redirects from left to right as follows:
- >>file. txt : Open file. txt in append mode and redirect stdout there.
- 2>&1 : Redirect stderr to “where stdout is currently going”. In this case, that is a file opened in append mode. In other words, the &1 reuses the file descriptor which stdout currently uses.
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.
What does nul 2 >& 1 do?
4 Answers. The 1 denotes standard output (stdout). The 2 denotes standard error (stderr). So 2>&1 says to send standard error to where ever standard output is being redirected as well.
