tee

clone output stream 

Command

SYNOPSIS

tee [-ai] [file ...]

DESCRIPTION

The tee command clones an output stream. It copies the standard input to each output file as well as to the standard output.

Options

-a 

appends to (rather than overwrites) each output file.

-i 

ignores interrupt signals, making it suitable for use as a background process. Since Windows systems do not support signals, this option does nothing on those systems.

EXAMPLES

prog | tee file

This runs the program prog and pipes the program's standard output into tee. As a result, tee writes the output to both the standard output and the specified file.

DIAGNOSTICS

Possible exit status values are:

0 

Successful completion.

1 

Failure due to any of the following:

— out of memory
— I/O error reading or writing to a file
— error creating an output file
— error opening an output file for append
2 

Failure due to invalid command line option.

PORTABILITY

POSIX.2. x/OPEN Portability Guide 4.0. All UNIX systems. Windows 10. Windows Server 2016. Windows Server 2019. Windows 11. Windows Server 2022. Windows Server 2025.

AVAILABILITY

PTC MKS Toolkit for Power Users
PTC MKS Toolkit for System Administrators
PTC MKS Toolkit for Developers
PTC MKS Toolkit for Interoperability
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Commands:
cat

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