I have a file, lets say "bigfile", with tabular data of the following form,

a1 b2 a3 1
b1 a2 c3 0
... and so on.

I want to use the built-in "sort" program on my Linux machine so sort this file by the fourth field(numeric) and then by the first field at the same time. I went through the man pages a couple of times and all I could come up with was,

sort -n -k4,4 -k1,1 bigfile

Is there a way to make "sort" do what I want or I have to write my own custom program?

Thank you.

linux shell unix sorting
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