in reply to Re: Need to write a file joining data in another two
in thread Need to write a file joining data in another two

That might not do the right thing if $2 isn't a key in the hash, also.

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Re^3: Need to write a file joining data in another two
by kennethk (Abbot) on Oct 22, 2010 at 23:13 UTC
    True, but it will do no harm and will emit a warning (unitialized value) with the correct input file line number, which is usually as much as you can hope for in this case.