ASCII table has some nonprintable characters. One of them is 07 -
Bell. It is a device control code originally sent to ring a small electromechanical bell on printers and teletypewriters to alert operators at the other end of the line, often of an incoming message. In unix you can input this character by pressing type it with
Ctrl + V and then
Ctrl + G which will be showed as
^G.
To set alarm for end of a task just put
echo ^G after the command, for example try the following line in your terminal:
sleep 2; echo ^G
Similar technique works with the
cat command.
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