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join file1 file2 > file3

Join lines of two files on a common field.  join parallels the database operation "join tables", but works on text tables.  The default is to join on the first field of the first table, and the default delimiter is white space. To adjust the defauls, I use options which I find using man join).

Example. if the content of file1 was:
1 Barbara
2 Peter
3 Stan
4 Marie
and file2 was:
2 Dog
4 Car
7 Cat
the resulting file3 would be:
2 Peter Dog
4 Marie Car

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