NAME

tee — duplicate standard input

SYNOPSIS

DESCRIPTION

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:

-a

Append the output to the files rather than overwriting them.

-i

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.

This implementation of the tee utility may also write to unix(4) sockets.

EXIT STATUS

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

EXAMPLES

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

$ echo "Hello" | tee greetings.txt
Hello

STANDARDS

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

HISTORY

The tee command first appeared in Version 7 AT&T UNIX.