Robustness is in the eye of the beholder. While you don't
throw away the first line if the file doesn't start with
the pattern, you throw away information if the pattern
appears twice in succession. And while it's given that the
file starts with the pattern; it isn't given a pattern cannot
appear twice. Hence your claim of "more robust" is at best
dubious.
About your remark of grep {$_}, note that the
result of split is an array of strings, and
"0.0" is true</code>, so the
grep {$_} will not filter out the 0.0.
-- Abigail
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