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}}