Order (or just read more about) SCO Unix in a Nutshell from Amazon.com
This is an out of date (1994) reference that predates OSR5. Still, since most of it covers commands that have and will remain the same or close to it, it has value. Most of what you will find here is still applicable, and it's all well done.
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More Articles by Tony Lawrence © 2011-04-30 Tony Lawrence
The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil (or at least most of it) in programming. (Donald Knuth)