build with bash

Before 'make' it must have been the case that people built their projects with shell scripts. When make appeared it was immediately and completely accepted but slowly it began to lose favour and there are now many elaborate alternatives. This project shows by demonstration that shell scripts could be a good way to do builds after all. A major advantage is that since everyone knows the shell there is nothing new to learn.
Make does two things. It cleverly infers a process to build a target from available resources, but as a distinct matter it skips the execution of any step in the process where it so happens that the product of the step exists already and is up to date. The first part is not usually what the user needs whereas the second part, which can avoid large amounts of redundant processing, is exactly what is wanted. The second part is simple enough to achieve with the shell.