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The tee Command

The tee command reads data from the standard input device, outputs its content to the standard output device, and simultaneously saves it as a file.

Syntax

tee [OPTION]... [FILE]...

Options

  • -a, --append: Append to the end of an existing file instead of overwriting it.
  • -i, --ignore-interrupts: Ignore interrupt signals.
  • -p: Diagnose errors writing to non-pipes.
  • --output-error[=MODE]: Set behavior on output write errors.
  • --help: Display help information.
  • --version: Display version information.

Modes

  • warn: Diagnose errors writing to any output.
  • warn-nopipe: Diagnose errors writing to any output that is not a pipe.
  • exit: Exit when errors writing to any output occur.
  • exit-nopipe: Exit when errors writing to any output (not a pipe) occur.

Examples

Save the user input data to both file1.txt and file2.txt. After entering the file information, press Enter to obtain feedback.

tee file1.txt file2.txt

Append the user input data to the file1.txt file.

tee -a file1.txt

List all files with the .txt extension in the current directory, one file name per line, pass the output through a pipeline to wc to count the lines and output the number, pass the output through a pipeline to tee to write it to the terminal, and write the information to the count.txt file, which counts the number of files with the .txt extension.

ls -1 *.txt | wc -l | tee count.txt

Daily Question

/~https://github.com/WindrunnerMax/EveryDay

References

https://www.computerhope.com/unix/utee.htm
https://www.runoob.com/linux/linux-comm-tee.html
https://www.tutorialspoint.com/unix_commands/tee.htm