10-09-2012
Quote:
Originally Posted by
Mike Smith
Tried -k2,2 and it binned loads of old entries which I wanted!
Say I have this data, the highest number (newest) one will always be at the top and I only want to keep the top one as everything right of, and including, column 2 is the same (nothing has changed since last sweep).
1349455502 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP
1349246545 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP
However if we get the following then I want both entries retaining
1349455502 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP
1349246545 ygtr-1b:3/1/19 Old customer name typed in here
-k2,2 seems to ONLY consider column 2 which is no good based on my first post's criteria.
This is tricky!
It isn't tricky at all. You can't say that the first field doesn't matter when throwing away duplicates
and at the same time say that you want the highest value for the first field to be the one that is kept when throwing away duplicates. If you care which duplicate is kept, you don't think they are duplicates. If you want both, you have to do it in two separate steps:
- sort in reverse order with the data from the start of field 2 to the end of the line as your primary sort key and the numeric value in field 1 as your secondary sort key, and then
- on a second pass, discard or ignore the second and subsequent lines that match (including field separators other than the separator between the 1st and 2nd fields) from the start of the 2nd field to the end of the line.
So why does it now matter which timestamp is kept when throwing away duplicates if it didn't matter when you were running this application on Solaris 8?
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