Have you ever wanted to change the names of many files at once? Or, have you ever needed to use a default value for a variable that has no value? These and many other options are available to you when you use string operators in bash and other Bourne-deri
The practical work supporting Chapter 4 introduces you to using an oscilloscope to display V/t graphs. This is a very powerful technique for investigating and understanding circuit behaviour and for correcting circuit faults.