If the substitution table is too large to load into a hash in its entirety, you could load in a portion of it, process the second file, and load in additional portions until it was completed. This way, you would have to make n passes of the secondary file, where the substitution file is loaded into n pieces.

This is, of course, assuming that you can't fit the substitution file entirely into RAM in a hash, and that using a tied hash is out of the question because of speed concerns. However, 130K lookups in a tied hash cannot take that long, so it might be a vialbe solution. If you were processing a file with 130M lines, then you are going to have to think of something else.

A curious observation, though, is that in your example the "output" file is the same as the input file, just reorganized. I'm sure this is because of simplification on your part.

In reply to Re^2: Search and replace on a 130000+ line file. by tadman
in thread Search and replace on a 130000+ line file. by brendonc

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