How do I redirect both stderr and STDOUT to a file?

2 Answers

1. Redirect stdout to one file and stderr to another file: command > out 2>error.
2. Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): command >out 2>&1.

How do I redirect stderr and STDOUT to a file in bash?

Bash executes the redirects from left to right as follows:

1. >>file. txt : Open file. txt in append mode and redirect stdout there.
2. 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.

How to redirect stderr to file and stdout?

I only found the solution to display stdout + stderr to the console and redirect both streams to a file as well: ( https://stackoverflow.com/questions/418896/how-to-redirect-output-to-a-file-and-stdout) But I only want to redirect stderr to the log file. With a recent bash, you can use process substitution.

How does stdout and stderr work in Linux?

The pipe feeds the original stderr of foo to tee, which saves it in a file and sends it to the screen. it pipes both ( stdout and stderr) to both ( screen and file) and let you capture the error if used in inline condition ( if ) or successive inline commands.

How to redirect stderr to a file in Bash?

To redirect stderr as well, you have a few choices: Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): Redirect both to a file (this isn’t supported by all shells, bash and zsh support it, for example, but sh and ksh do not):

How to redirect standard error to the current standard output?

The 2>&1 in the bash command quite easily lets you redirect standard error to the current standard output (as desired) without prior knowledge of where standard output is currently going. I object the above answer and provide my own. csh DOES have this capability and here is how it’s done:

How do I redirect both stderr and stdout to a file?

2 Answers

1. Redirect stdout to one file and stderr to another file: command > out 2>error.
2. Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): command >out 2>&1.

How do I redirect stderr and stdout to a file in bash?

Bash executes the redirects from left to right as follows:

1. >>file. txt : Open file. txt in append mode and redirect stdout there.
2. 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.

Which of the following are used to redirect stdout and stderr to a file?

Output from a console (Command Prompt) application or command is often sent to two separate streams. 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.

How to redirect stdout and stderr to another file?

Error messages, like the ones you show, are printed to standard error. The classic redirection operator (command > file) only redirects standard output, so standard error is still shown on the terminal. To redirect stderr as well, you have a few choices: Redirect stdout to one file and stderr to another file: command > out 2>error

How to redirect stderr to a file in Bash?

To redirect stderr as well, you have a few choices: Redirect stdout to a file ( >out ), and then redirect stderr to stdout ( 2>&1 ): Redirect both to a file (this isn’t supported by all shells, bash and zsh support it, for example, but sh and ksh do not):

How to redirect errors from stderr to Nul?

To redirect (only) the error message to NUL, use the following command: Or, you can redirect the output to one place, and the errors to another. You can print the errors and standard output to a single file by using the “&1” command to redirect the output for STDERR to STDOUT and then sending the output from STDOUT to a file:

What happens when you redirect a message to a file?

Error messages, like the ones you show, are printed to standard error. The classic redirection operator (command > file) only redirects standard output, so standard error is still shown on the terminal.