Redirect output to multiple files, copies standard input to standard output and also to any files given as arguments. This is useful when you want not only to send some data down a pipe, but also to save a copy.

Syntax
      tee [options]... [file]...

Options
   -a
   --append
        Append standard input to the given files rather than overwriting
        them.

   -i
   --ignore-interrupts'
        Ignore interrupt signals.

Example:

   ps -ax | tee processes.txt | more

If a file being written to does not already exist, it is created.
If a file being written to already exists, the data it previously contained is overwritten unless the `-a’ option is used.

The name tee is derived from plumbing terminology: T for a T-shaped pipe splitter.

Related linux commands:

echo – Display message on screen
head – Output the first part of file(s)
less – Display output one screen at a time
more – Display output one screen at a time
pg – Display one page at a time
Equivalents in Windows Batch/Perl Script – TEE Scripts

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