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   vi.1p    ( 1 )

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Стандартный ввод (Stdin)

If standard input is not a terminal device, the results are
       undefined.  The standard input consists of a series of commands
       and input text, as described in the EXTENDED DESCRIPTION section.

       If a read from the standard input returns an error, or if the
       editor detects an end-of-file condition from the standard input,
       it shall be equivalent to a SIGHUP asynchronous event.