sorting fields

[Guest_imported]

I have a large csv file that looks like this:

14 ,M0081,+000000001,200302,+00000100500,
14 ,M0081,+000000004,200301,+00000100500,
14 ,M0081,+000000005,200305,+00000100500,
14 ,M0081,+000000000,200205,+00000100500,
14 ,M0081,+000000008,200204,+00000100500,

I need to sort on the first, second and fourth fields so that it would look like this:

14 ,M0081,+000000008,200204,+00000100500,
14 ,M0081,+000000000,200205,+00000100500,
14 ,M0081,+000000004,200301,+00000100500,
14 ,M0081,+000000001,200302,+00000100500,
14 ,M0081,+000000005,200305,+00000100500,


I'm looking at sort -k but haven't got it yet
or something with sort -t, ?

Thanks

 

[Guest_imported]

this did the trick:

sort -t, -k 1,2 -k 4,4