"For me, the hardest part about teaching the LPI 101
course is teaching about text-stream filters. It's not that they're
difficult to understand. It's just that showing the examples of how
they work is easy, but showing examples of how they can be used in
real life is a bit more challenging. Real-life examples from the
Linux admin world are fairly complex, and are beyond the level that
most beginning Linux students are able to grasp. So, in most LPI
books, the student will see how these utilities work, but not how
to use them.
"Text-stream filters can be used as stand-alone tools, if you
have occasion to use them in that manner. But, you can also use
them in scripts to solve problems, whether you're a Linux admin or
just a home user. Here's an example of how I used text-stream
filters to solve a long-standing problem on one of my home
computers. (In fact, it's the computer that I'm using to type
"This particular computer has a problem with CPU-overheating. If
I try to run it at its full rated speed of 2.7 GHz with a room
temperature above about 70 degrees or so Fahrenheit, the CPU
temperature will soon climb up to 212 degrees, which will cause the
computer to shut down."
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