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Yes.

$ sort -t, -k2,2n medium.txt
58,1
30,2
39,3
57,3
72,3
61,5
7,5
85,6
23,7
71,7
21,9
19,10
0,11
20,11
38,11
14,13
54,13

Ok here it is not sorting properly. 14 and several other numbers should not be as low as they are.

$ sort -n -k 1,1 medium.txt
0,11
7,5
21,9
23,7
30,2
39,3
57,3
58,1
61,5
71,7
72,3...

From googling and reading man pages I figured out this sorts the first column by numeric values.

sort -g -k 1,1

Why does the -n option not work? The man pages were a bit confusing.

And...