tldr/pages/common/join.md

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# join
> Join lines of two sorted files on a common field.
- Join two files on the first (default) field:
`join {{file1}} {{file2}}`
- Join field3 of file1 with field1 of file2:
`join -1 3 -2 1 {{file1}} {{file2}}`
- Produce a line for each unpairable line for file1:
`join -a 1 {{file1}} {{file2}}`