How do I redirect the output and error of a command to a file in Linux?

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How do I redirect the output and error of a command to a file in Linux?

The syntax is as follows to redirect output (stdout) as follows:

  1. command-name > output.txt command-name > stdout.txt.
  2. command-name 2> errors.txt command-name 2> stderr.txt.
  3. command1 > out.txt 2> err.txt command2 -f -z -y > out.txt 2> err.txt.
  4. command1 > everything.txt 2>&1 command1 -arg > everything.txt 2>&1.

What is the Linux command to redirect the standard error stderr to a file named error txt when we run a program?

Use 2>&1 Syntax to redirect standard error to the same location as standard output .

What is error redirection in UNIX?

stderr Redirection. Redirect standard error (error messages) to a file (instead of the terminal) using the 2> metacharacter. The 2>&1 metacharacter redirects stderr to the same file that stdout was redirected to.

How do I redirect output in Linux?

Summary

  1. Each file in Linux has a corresponding File Descriptor associated with it.
  2. The keyboard is the standard input device while your screen is the standard output device.
  3. “>” is the output redirection operator. “>>”
  4. “<” is the input redirection operator.
  5. “>&”re-directs output of one file to another.

What is an error redirection?

Error redirection is routing the errors to a file other than the screen.

How do I fix input error in Linux?

fsck

  1. boot to a Ubuntu Live DVD/USB in “Try Ubuntu” mode.
  2. open a terminal window by pressing Ctrl + Alt + T.
  3. type sudo fdisk -l.
  4. identify the /dev/sdXX device name for your “Linux Filesystem”
  5. type sudo fsck -f /dev/sdXX , replacing sdXX with the number you found earlier.
  6. repeat the fsck command if there were errors.

How do you redirect error messages in Unix?

To redirect stderr as well, you have a few choices:

  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 in Unix?

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 to redirect error messages to a file?

To redirect standard error messages to a file, enter: command 2> file. Replace command with the command you want to execute and file with the file to which you want to direct the errors, for example: gunzip * 2> ~/errors. If you wish to suppress error messages, enter: command 2>&-. If you wish to redirect error messages to standard output, enter:

How to redirect error output to a file in Linux?

Linux Redirect Error Output To File. Syntax To redirect all output to file. Syntax To redirect all error to file. Syntax to redirect both output (stdout) and errors (stderr) to different files. Syntax to redirect both output (stdout) and errors (stderr) to same file. Syntax to redirect errors (stderr) to null or zero devices.

How to redirect command error output / dev / null?

How can I redirect command error output /dev/null on a Linux or Unix-like system using Bash shell? stdin – 0 – St an d ard In put (usually keyboard or file) stderr – 2 – St an d ard Err or (usually screen) What is a null (/dev/null) file in a Linux or Unix-like systems? /dev/null is nothing but a special file that discards all data written to it.

How to redirect error messages in Unix-IU?

The csh and tcsh shells have substantially less flexible redirection capabilities. However, from sh or tcsh you can invoke a Bourne-like shell to run a command that redirects standard error messages. To redirect standard error messages, enter the following: You can use sh or bash in the place of ksh.