01-10-2010
compare 2 very large lists of different length
I have two very large datasets (>100MB) in a simple vertical list format. They are of different size and with different order and formatting (e.g. whitespace and some other minor cruft that would thwart easy regex).
Let's call them set1 and set2.
I want to check set2 to see if it contains any of the data entries in set1. I think of this as individual greps of set2 using each line of set1.
(NB- I could, with some work, manipulate the sets to make the order and formatting the same.)
In your opinion, what is the best tool to use for this search of set2 using the data in set1?
- comm?
- a looping shell script, or xargs, that calls grep?
- grep -f?
- diff?
- combine the sets (after making format the same) then sort and print only duplicate lines? uniq -d, sed or awk
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