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Not sure if i understood correctly, but this may helps:
# awk '{a[$NF]=sprintf("%s%s ",a[$NF],$1)}END{for (i in a){print i,a[i]}}' infile
1.1.1.1 app1 app3
1.1.1.2 app2
1.1.1.3 app4

If $3>B[i] works with your awk implementation (I know it works with at least some mawk versions, if not all) then it's because it's violating POSIX. That should be performing a string comparison for...

One way :
~/unix.com$ awk 'NR==FNR{A[$1]++;next}A[$1]==2' file.txt file.txt

Try this..


sort file | awk '/request/ {s=$0;p=$1;getline} {if ($0 ~ /response/ && $1 == p) { print s"\n"$0 }}'