NAME
  tee - duplicate standard input

SYNOPSIS
  tee [-ai] [file...]

DESCRIPTION
  The tee utility shall copy standard input to standard output, making a copy in
  zero or more files. The tee utility shall not buffer output.

  If the -a option
  is not specified, output files shall be written.

OPERANDS
  file  A pathname of an output file. If a file operand is '-', it refer to a
        file named '-'

OPTIONS
  -a  Append the output to the files.
  -i  Ignore the SIGINT signal.

EXIT STATUS
  0   The standard input was successfully copied to all output files.
  >0  An error occurred.