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You always have something interesting to contribute, so: you're welome!



You noted some very good books and, yes, if we are talking shell programming they might be better places to look at...

Hi.

Apologies to jump in here with such a lengthy post.


And I heartily agree with that.

However, that 700-page tome might not be the best place for shell scripting practices. If one is...

You can use an extra descriptor for reading from the file.
The stdin=1 default remains where it is (usually /dev/tty but who knows?)
while read -r line <&3
do
echo "$line"
...
done 3<"$1"

Just the way Scott has pointed out to you - it is one of the "correct" ways to solve that problem.

Something you might think about is to "structure" your program differently, but this has nothing...

In addition to what MadeInGermany has already said, I'm confused by the "pattern" you've shown us above. I would guess that rather than that being a pattern, it is a sample of the data that might be...

I'm not sure what "risk" you expect. As is, the awk script will read only the files and output to screen. I don't think any damage can be done hereby.
There are, howsoever, some improvement...