TEE(1) General Commands Manual TEE(1)

teeduplicate standard input

tee [-ai] [file ...]

The tee utility copies standard input to standard output, making a copy in zero or more files. The output is unbuffered.

The following options are available:

Append the output to the files rather than overwriting them.
Ignore the SIGINT signal.

The following operands are available:

file
A pathname of an output file.

The tee utility takes the default action for all signals, except in the event of the -i option.

The tee utility exits 0 on success, and >0 if an error occurs.

Send the echoed message both to stdout and to the greetings.txt file:

$ echo "Hello" | tee greetings.txt
Hello

The tee utility is expected to be IEEE Std 1003.2 (“POSIX.2”) compatible.

June 23, 2020 Mac OS X 12