Source code allows software to be immortal.
You can take software from years even decades ago and still reuse it. For example, found some accounting source code originally written as early as the 1970's that can be compiled and used on present day systems. Albeit that the software needs some polish to be presentable by today's standards, it still works just as well. Account setup: Then you can enter some data: Lastly, you can view the results of your entries say in a simple t-account format: The datafile: $ cat bizness 02052015 XX X X X X X XXXXXXXXassets XXXXXXXXXXXXXXXliabilities XXXXXXXXXXXXXXXcapital XXXXXXXXXXXXXXXincome XXXXXXXXXXXXXXXexpenses ...