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`tee': Redirect output to multiple files

   The `tee' command 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.  Synopsis:

     tee [OPTION]... [FILE]...

   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 program accepts the following options.  Also see Note: Common

     Append standard input to the given files rather than overwriting

     Ignore interrupt signals.

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