join: database operator
join merges two files using the values in a field
in each file as a common key.
The key field can be in a different position in each file,
but the files must be ordered on that field.
The default key field is 1.
Some options:
-1 k |
| key field in first file is k |
-2 k |
| key field in second file is k |
-a N |
| print a line for each unpairable line in file N (1 or 2) |
-i |
| ignore case |
-t c |
| tab character is c |
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