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sorting file based on two or more columns

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# 1  
Old 09-16-2008
sorting file based on two or more columns
Hi gang.

I'm using a unix/mac system and i'm trying to sort a file (more than 1,000,000 lines).

Code:
chr1    100000965       100001001       -
chr1    100002155       100002191       +
chr1    100002165       100002201       +
chr1    100002525       100002561       -
chr1    10000364        10000400        -
chr1    10000372        10000408        -
chr1    10000412        10000448        +
chr1    100004742       100004778       -
chr1    100004767       100004803       +

I want to sort the first column (text and it could be any of 24 chrom) and then sort by 4th column and then by 2nd column.

I tried sort command but when i type in sort +3 +1, it doesn't work.
# 2  
Old 09-17-2008
Code:
sort -k3n,1 FILENAME

# 3  
Old 09-17-2008
Thanks cfajohnson. it works. can you explain to me how the parameters work here?
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