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need to remove duplicates based on key in first column and pattern in last column

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# 8  
Old 09-01-2010
Quote:
Originally Posted by script_op2a
Is there a reason to have a[4]a[5] , why not just use a[4] and then awk doesn't even have to remove anything?
Using both allows the timestamp to be used in determining the most recent entry which would be necessary should two entries have the same date.
# 9  
Old 11-23-2010
Hello,

Could anyone help me modify this script to output 1 file containing the unwanted duplicates and the other containing just the desired records?
# 10  
Old 11-23-2010
a simple solution, base on previous script.

Code:
awk '{split($4,a,"_"); if (b[$1]<=a[4]a[5]) {b[$1]=a[4]a[5];c[$1]=$0}}
END{for (i in b) print c[i]}' infile  |sort > desired_records

sort infile > temp2

diff desired_records temp2 |awk '/^>/ {$1="";print}'> unwanted_duplicates_records

This User Gave Thanks to rdcwayx For This Post:
script_op2a
# 11  
Old 11-24-2010
Code:
sort -t_ -k1,1 -k4rn < infile | awk -F_ 'NF{if(A[$1,$2,$3]++)print>"dups.out";else print}' > recs.out

# 12  
Old 11-24-2010
Quote:
Originally Posted by rdcwayx
a simple solution, base on previous script.

Code:
awk '{split($4,a,"_"); if (b[$1]<=a[4]a[5]) {b[$1]=a[4]a[5];c[$1]=$0}}
END{for (i in b) print c[i]}' infile  |sort > desired_records

sort infile > temp2

diff desired_records temp2 |awk '/^>/ {$1="";print}'> unwanted_duplicates_records

This almost works. The only problem is that it puts a blank space in front of every line in the
Code:
unwanted_duplicates_records

file.

Is there any way we can fix this?
# 13  
Old 11-24-2010
Code:
diff desired_records temp2 |awk '/^>/ {$1="";print}'|sed 's/^ //' > unwanted_duplicates_records

# 14  
Old 05-18-2011
This is what I finally used:

Code:
diff $outfile $temp_sort_file |awk '/^>/ {print $0}'|sed 's/^> //' > $temp_dups_file

It works with most of my files.

I'm trying to understand it.

What is the awk part doing exactly? What is
Code:
^>

?

And what is the sed part doing? What is
Code:
's/^> //'

?
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