Hi,
  I want to sort a file and  want to write the result
to same file....
I want to sort a based on 3rd column..

following is my file format

 C1   C2   C3     C4
1234 guhr 89890 uierfer
1324 guii 60977 hiofver
5467 frwf 56576 errtttt


i want to sort above file based on column 3(C3)
and i want to write sorted result to same file....

After sorting my file should be 

5467 frwf 56576 errtttt
1324 guii 60977 hiofver
1234 guhr 89890 uierfer



how to do this ?
file may have around 20 millions rows ......

I appreciate u r help..

-Madhu



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