csv-join-columns

Take a set of CSV files with partially-overlapping columns and merge them by intelligently joining column headers.

For instance, say you have:

csvA.txt:

Date,A,B,C
2015-12-01,5,7,9

csvB.txt:

Date,B,C,D
2015-12-01,4,3,2

Running csv-join-columns csvA.txt csvB.txt will produce:

Date,A,B,C,D
2015-12-01,5,7,9,
2015-12-01,,4,3,2