What it does
This tool joins two tabular files based on a common key column.
Example
First file:
Fruit Color Apple red Banana yellow Orange orange Melon green
Second File:
Fruit Price Orange 7 Avocado 8 Apple 4 Banana 3
Joining both files, using key column 1 and a header line, will return:
Fruit Color Price Apple red 4 Avocado . 8 Banana yellow 3 Melon green . Orange orange 7