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 Documented in Volume 1 of the UNIX Programmers Manual.

 % sort /etc/passwd | tee sorted.data
  sorts the password file, lists it at the terminal, and at the same
  time, captures it in the file sorted.data

  HINT: tee is usually used in a pipe arrangement.

 % tee x
  accepts input from the keyboard, lists it to the standard output,
  simultaneously storing it into file x.

 % cat /dev/null | tee x1 x2 x3 x4
  is a convenient way to quickly create three null files named x1, x2 and x3.

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