Sort CSV file by column priority using the “sort” command

Question

I have a csv file, and I would like to sort it by column priority, like \"order by\". For example:

3;1;2
1;3;2
1;2;3
2;3;1
2;1;3
3;2;1

If t

Answer 1

Suppose you have another row 3;10;3 in your unsorted.csv file. Then I guess you expect a numerically sorted result:

2;1;3
3;1;2
1;2;3
3;2;1
1;3;2
2;3;1
3;10;3

and not an alphabetically sorted one:

2;1;3
3;1;2
3;10;3
1;2;3
3;2;1
1;3;2
2;3;1

To get that, you have to use -n:

sort --field-separator=';' -n -k 2,2 -k 1,1 -k 3,3 unsorted.csv

It is worth mentioning that 2,2 has to be used. If only 2 is used, then sort takes the string from beginning of field 2 to the end. 2,2 makes sure that only field 2 is used.