Here's my task in plain language:
Compare two files of different sizes, each with two columns:
For each element(s) in the first column of the larger file,
find all matches to those elements in the first column of the smaller file,
and
Then print the matching row(s) of the larger file, followed by the matching
rows of the smaller file.
Sometimes there will be more than one element in the larger file that is
duplicated. For those,
print the duplicated rows from the larger file before printing the matching
rows of the smaller file.
The output file should be two columns, with the first column containing the
pertinent
(i.e., duplicated) elements, and the second column listing all the associated
instances.
There aren't any duplications in the second column of either file;
and nothing in either second column matches anything in the other second
column.
This seems easy enough to explain and to perform by visual inspection,
but only a script will work for the main files.
I'm attaching three files: LargerFile.txt; SmallerFile.txt; and
OutputFile.txt.
They've been obtained by visually matching the Real-LargerFile.txt (500,000
rows)
with the Real-SmallerFile.txt (200,000 rows) and then doing some obfuscation.
All files are sorted on their first columns.
George Langford
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