It's not exactly clear what you're trying to
do, but here are a couple of possibilities:
If you only want to show the first 70
characters of each line then read the lines in
one at a line and use substr.
If you want to reformat the paragraphs so
that they are no more that 70 characters wide,
then read the whole paragraph in and reformat
it using Text::Wrap.
Originally posted as a Categorized Answer.
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