I need some advice on a classic sorting problem. Below is a little example of what my data looks like.

Data.txt
1.000    64.103    2840.0
1.000    42.735    2840.0
1.000    32.051    2840.0

1.050    64.103    3280.0
1.050    42.735    3280.0
1.050    32.051    3280.0

1.100    64.103    3720.0
1.100    42.735    3720.0
1.100    32.051    3720.0
[download]

I'd like my data to be first sorted by the second column then by the first column. It should look like the below example.

1.000    64.103    2840.0
1.050    64.103    3280.0
1.100    64.103    3720.0

1.000    42.735    2840.0
1.050    42.735    3280.0
1.100    42.735    3720.0

1.050    32.051    3280.0
1.000    32.051    2840.0
1.100    32.051    3720.0
[download]

I started using nested foreach loops but it started getting a little hairy, so I figured I'd ask the wise Monks. Thank you in advance for your time!

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