Ah, I remember seeing this when it was first posted in comp.lang.c and being duly impressed. I had definitely a printed typeset copy in various work environments.
Remember, it was a time when the language had no function prototypes, and we were seeing more and more code abusing parameter passing and value returning by "knowing" what happens.
Re-reading it now, I'm amazed on how general the commandments are, the underlying wisdom applicable to any language and system.
> Thou shalt study thy libraries and strive not to re-invent them without cause,
that thy code may be short and readable and thy days pleasant and productive.
Just reading through the list of names of libraries in a package manager is more than I can handle, let alone reading through their APIs. I imagine this was a bit more possible to do in the 80s. Still though, I wish there was a more manageable way to handle this.