Hands-On System Programming with Linux

A few trial runs

When we simply run the program without passing any parameters, the help screen is displayed:

$ ./runwalk_timer Usage: ./runwalk_timer Run-for[sec] Walk-for[sec] [verbosity-level=0|[1]|2] Verbosity Level :: 0 = OFF [1 = LOW] 2 = HIGH$ 

As can be seen, the program expects a minimum of two parameters:

• The time to run (in seconds) [required]
• The time to walk (in seconds) [required]
• The verbosity level [optional]

The optional third parameter, the verbosity level, allows the user to request more or less information as the program executes (always a useful way to instrument, and thus help debug, programs). We provide three possible verbosity levels:

• OFF: Nothing besides the required matter is displayed (pass the third parameter ...