-a n In addition to the normal output, produce a line for each unpairable line in file n, where n is 1
or 2.
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-v n Like -a, omitting output for paired lines.
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-e s Replace empty output fields by string s.
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-1 m
-2 m Join on the mth field of file1 or file2.
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-jn m Archaic equivalent for -n m.
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-ofields
Each output line comprises the designated fields. The comma-separated field designators are
either 0, meaning the join field, or have the form n.m, where n is a file number and m is a field
number. Archaic usage allows separate arguments for field designators.
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-tc Use character c as the only separator (tab character) on input and output. Every appearance of c
in a line is significant.
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