Re: sort's -u is Failing to Check all -k fields for Uniqueness.

[Andreas Schwab]

Ralph Corderoy <address@hidden> writes:

>     $ echo 1/3,1/2,1/1,2/1 | tr , \\012 | sort -nu -t / -k 1,2
>     1/3
>     2/1
>     $
>
> -u should only filter out lines that compare equal on *all* key fields.

There is only one sort key, which spans the first two fields of each line,
and -n tells sort to only consider the numeric prefix of each key.  If you
want to sort on multiple keys you need to specify each key separately.

$ echo 1/3,1/2,1/1,2/1 | tr , \\012 | sort -nu -t / -k 1,1 -k2,2
1/1
1/2
1/3
2/1

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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