Learning Linux/Unix with man(1)

A Crash Course in Unix

You really can learn a lot from the unix man pages. In addition to the basic usage of a command, the man page also shows what environment variables it uses, gives some examples, and lists some related commands. I've been using one unix variant or another for more than 15 years and I've learned oodles from man pages.

Here's a brief list of essential commands that should help you lots:

Then you can string some of these together to get a list of unique IP addresses that requested /node/100647 out of an access log, try:
% grep /node/100647 access.log | awk '{ print $1 }' | sort | uniq -c

Other readings:

Doug Harris