Awk scripts to read rows in a column with the same/differen value

Hello gurus,

If we have a csv input here

Code:

Apple_ID, FDA_ID,Date

567,3, �10/12/2008 12:00:00 AM�

567,1, �10/12/2007 12:00:00 AM�

348,1, �10/12/2008 12:00:00 AM�

567,2, �10/12/2009 12:00:00 AM�

And we like to read the first column, if the Apple_ID is the same (567 for example) AND FDA_ID (1,2,3 for example) is different, print the row with the most recent Date (567,2, �10/12/2009 12:00:00 AM� in this case).

In this case, the desire output would be:

Code:

Apple_ID, FDA_ID,Date

348,1, �10/12/2008 12:00:00 AM�

567,2, �10/12/2009 12:00:00 AM�

We try to write some arrays using the examples in other posts but doesn�t seem to work.

http://unix.stackexchange.com/questi...r-column-value

Any hint could be quite helpful. Thanks!

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