Wrt memory usage: my mistake. The immediate problem I saw with using foreach instead of while is that foreach provides an array context, whereas while provides a scalar context. Therefore, when you use foreach, the <FILE> slurps the entire file at once and creates a list for the foreach to cycle through. Then you are pushing each element into @data, from where I assumed the data would be duplicated. However, reading the foreach documentation, I see the following:
...each element of the list is aliased to the loop variable in turn ... Note that the loop variable becomes a reference to the element itself, rather than a copy of the element.Therefore you will not be duplicating data. You are reading the whole file in memory only once, not twice as in my original message.
However, I still think reading the whole file in memory is a bad idea, because you will eventually find a file that will not fit in memory. Unless there are other reasons for doing it, I will always prefer to process it one line at a time.
--ZZamboni
In reply to RE: RE: RE: Re: How do I remove blank lines from text files?
by ZZamboni
in thread How do I remove blank lines from text files?
by dumpest
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