FAQ: How Redirect Standard Output To A File In Linux?

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List:

  1. command output.txt. The standard output stream will be redirected to the file only, it will not be visible in the terminal.
  2. command output.txt.
  3. command 2 output.txt.
  4. command 2 output.txt.
  5. command output.txt.
  6. command output.txt.
  7. command | tee output.txt.
  8. command | tee -a output.txt.

How do I redirect standard output 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 output to a file in Linux?

Option One: Redirect Output to a File Only To use bash redirection, you run a command, specify the > or >> operator, and then provide the path of a file you want the output redirected to. > redirects the output of a command to a file, replacing the existing contents of the file.

How do I redirect standard output and error to a file in Linux?

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 do you redirect output?

On a command line, redirection is the process of using the input/output of a file or command to use it as an input for another file. It is similar but different from pipes, as it allows reading/writing from files instead of only commands. Redirection can be done by using the operators > and >>.

How do I redirect standard output to Dev Null?

You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will use the standard error (FD # 2). So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null.

Why do we use 2 >> redirection?

2> redirects stderr to an (unspecified) file, appending &1 redirects stderr to stdout.

What is output redirection in Linux?

Output redirection is used to put output of one command into a file or into another command.

What is Linux standard output?

Standard output, sometimes abbreviated stdout, refers to the standardized streams of data that are produced by command line programs (i.e., all-text mode programs) in Linux and other Unix-like operating systems. That default destination is the display screen on the computer that initiated the program.

How do I redirect error and output to a file?

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):

Which command will redirect whole output to file called as file1?

< file1. in a shell command instructs the shell to read input from a file called “file1” instead of from the keyboard. EXAMPLE:Use standard input redirection to send the contents of the file /etc/passwd to the more command: more < /etc/passwd.

What are the redirect option to use for sending both standard output and standard error to the same location?

Use the shell syntax to redirect standard error messages to the same place as standard output. where both is just our (imaginary) program that is going to generate output to both STDERR and STDOUT.

What is ambiguous output redirect?

The “ambiguous redirect” error sometimes happens if you either have spaces where they shouldn’t be, or conversely when an important space is missing. The “>/tmp/x. txt” part will redirect stdout (file handle #1).

How do I copy terminal output to a file?

There are 2 options,

  1. Either you can copy-paste the selected text using Ctrl + Shift + C and Ctrl + Shift + V in which you have freedom what things to copy OR.
  2. Redirect the text to a file using redirection. program1 >outputfile.txt 2>errorfile.txt. here, all the stdout will go to outputfile.