конвертировать и копировать файл (convert and copy a file)
Асинхронные события (Asynchronous events)
For SIGINT, the dd utility shall interrupt its current
processing, write status information to standard error, and exit
as though terminated by SIGINT. It shall take the standard action
for all other signals; see the ASYNCHRONOUS EVENTS section in
Section 1.4, Utility Description Defaults.
