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# 1  
Old 08-15-2016
Sort unique
Hi,

I have an input file that I have sorted in a previous stage by $1 and $4. I now need something that will take the first record from each group of data based on the key being $1


Input file

Code:
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000AAA|"ZZZ"|"Date"|"2"|"Y"|"ABC"|""|AA
1000AAA|"ZZZ"|"Date"|"3"|"Y"|"ABC"|""|AA
1000AAA|"ZZZ"|"Date"|"4"|"Y"|"ABC"|""|AA
1000AAA|"ZZZ"|"Date"|"5"|"Y"|"ABC"|""|AA
1000AAA|"ZZZ"|"Date"|"6"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"2"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"3"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"4"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"5"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"6"|"Y"|"ABC"|""|AA
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"2"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"3"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"4"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"5"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"6"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"2"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"3"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"4"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"5"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"6"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"2"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"3"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"4"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"5"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"6"|"Y"|"ABC"|""|BB

Required output

Code:
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB

I was thinking of doing a sort -u command but when I do that, it discards the 2nd row from the Required output

Command

Code:
sort -u -k1,1n file.txt > file2.txt

Output

Code:
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB

# 2  
Old 08-15-2016
Code:
$ awk -F\| '!a[$1]++' a.txt
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB


Code:
$ sort -t\| -u -k1,1 a.txt
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB

Last edited by itkamaraj; 08-15-2016 at 05:50 AM..
# 3  
Old 08-15-2016
You're close. Try
Code:
sort -t"|" -u -k1,1 file
1000AAA|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
1000BBB|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA
2100|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2200|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB
2222|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB

Please be aware that this does NOT necessarily yield the respective first record in terms of $4...
Last edited by RudiC; 08-15-2016 at 05:59 AM..
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