Greetings, Andy Hall!
> This behavior of join surprised me:
> $ join -1 3 <(echo a b col3 c d | unix2dos) <(echo col3 f2 f3 f4 f5)
> f2 f3 f4 f5
> Join parses the input line well enough to execute the join, but the
> presence of the DOS line endings suppresses the
> output of fields from the first input.
> Compare with
> $ join -1 3 <(echo a b col3 c d) <(echo col3 f2 f3 f4 f5)
> col3 a b c d f2 f3 f4 f5
> which is correct.
> Here is a weirder example where the join field is missing and the output is
> reversed!
> NOK
> $ join <(echo col F1 | unix2dos) <(echo col F2)
> F2 F1
This makes perfect sense and actually explains what you see.
1. ("col", "F1\r") & ("col", "F2")
2. ("col", "F1\r", "F2")
3. printing "col F1\r F2"
4. obvious result: "col F1", then \r place cursor at the beginning of the
line, then " F2" overprints the line beginning.
5. observed result: " F2 F1"
> OK
> $ join <(echo col F1) <(echo col F2)
> col F1 F2
As Eliot said, don't do that.
--
With best regards,
Andrey Repin
Tuesday, July 23, 2019 9:45:05
Sorry for my terrible english...
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