Sometimes I need to explicitly indicate execution of specified shell script or just action taken inside it. My favorite way is to use advanced pc-speaker beeper, which is directly available in Debian repository.
To install the package execute the following command.
$ sudo apt-get install beep
Now you can utilize
beep command as you can imagine it. I will shortly describe basic usage so you can quickly catch up and use it to indicate defined states, actions or errors.
Beep using specified Hz in range of 0 to 20000.
$ beep -f 500
Beep for specified period of time (defined in milliseconds).
$ beep -f 500 -l 700
Repeat beep multiple times.
$ beep -f 500 -l 200 -r 3
Beep multiple times using different settings.
$ beep -f 500 -l 200 -n -f 600 -l 200 -n -f 700 -l 200 -n -f 600 -l 200
Beep after each new line.
$ sudo tail -n 0 -f /var/log/messages | beep -s
Detailed description including potential issues, useful examples and frequency table can be found in the manual page.
$ man beep