tldr/pages/common/join.md

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# join
> Join lines of two sorted files on a common field.
> More information: <https://www.gnu.org/software/coreutils/join>.
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- Join two files on the first (default) field:
`join {{file1}} {{file2}}`
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- Join two files using a comma (instead of a space) as the field separator:
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`join -t {{','}} {{file1}} {{file2}}`
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- Join field3 of file1 with field1 of file2:
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`join -1 {{3}} -2 {{1}} {{file1}} {{file2}}`
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- Produce a line for each unpairable line for file1:
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`join -a {{1}} {{file1}} {{file2}}`