Also that looking through the manual at things you already (think you) know, you learn a lot. There was a time when all OS's did this. I had a DOS binder, from

Also that looking through the manual at things you already (think you) know, you learn a lot. There was a time when all OS's did this. I had a DOS binder, from which I learned 80x86 Assembler from the Debug chapter. And since I grew up on QNX, I managed to score myself a set of QNX manuals that are actually still on my shelf today because its such an interesting OS. Nowadays we're paperless. The info is all still there. Just not as beautifully presented.