uu_join 0.0.21

join ~ (uutils) merge lines from inputs with matching join fields
Documentation 
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# join

```
join [OPTIONS] <FILE1> <FILE2>
```

For each pair of input lines with identical join fields, write a line to
standard output. The default join field is the first, delimited by blanks.

When `FILE1` or `FILE2` (not both) is `-`, read standard input.