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Introduction to Linux - A Hands on Guide
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unlike syg00, I love parameter substitution. It's flexible and powerful and I don't find it difficult at all. You really only need to memorize a handful of patterns to get most of the benefit, and many of those are similar to ones you encounter elsewhere. It's also more efficient than calling on external tools like sed. Of course it can't tackle everything, but it's great for doing simple text manipulations.
And yes, I posted the link so you could learn more about it yourself. But to summarize the pattern I used, it says "remove from the beginning the longest string that matches 'anything + not a number'".