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   ed.1p    ( 1 )

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Асинхронные события (Asynchronous events)

The ed utility shall take the standard action for all signals
       (see the ASYNCHRONOUS EVENTS section in Section 1.4, Utility
       Description Defaults) with the following exceptions:

       SIGINT    The ed utility shall interrupt its current activity,
                 write the string "?\n" to standard output, and return
                 to command mode (see the EXTENDED DESCRIPTION section).

       SIGHUP    If the buffer is not empty and has changed since the
                 last write, the ed utility shall attempt to write a
                 copy of the buffer in a file. First, the file named
                 ed.hup in the current directory shall be used; if that
                 fails, the file named ed.hup in the directory named by
                 the HOME environment variable shall be used. In any
                 case, the ed utility shall exit without writing the
                 file to the currently remembered pathname and without
                 returning to command mode.

       SIGQUIT   The ed utility shall ignore this event.