Update of bug #20883 (project coreutils):
Assigned to: None => rwp
Open/Closed: Open => Closed
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Follow-up Comment #1:
Thanks for the report but this is not a bug but simply a misunderstanding of
what sort is using as a sort key. Note that since this is an anonymous bug
posting I cannot respond other than by posting a response to the bug.
By default sort will consider the entire line as the sort key. When using
the -n numeric sort flag this is still true. The reason sort -u is collapsing
lines is because the sort key cause sort to believe the lines are equivalent.
Unless -k is specified to restrict the sort key the default key is the entire
line.
The way to sort that input numerically on two different fields is to use the
-k option to select both fields. Try this:
sort -k1,1n -k2,2n -u
1 1
1 2
1 3
2 1
3 1
That will provide the result that you are looking to achieve.
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