When I first learned to program, it was grasping if statements that helped it all click into place for me. Once you can use if statements, you can build all kinds of useful and interesting tools.

Different solutions can solve this multiple form submission situation. Some transactional sites simply warn the user to wait for a response after submitting and not to submit twice. More sophisticated ...

The last of the basic building blocks of shell scripting are conditional statements, allowing you to decide programmatically whether to execute a block of statements based on a logical test, and flow ...