Issue
I am trying to display the second result of duplicate lines in a text file.
Data:
60 60 61 64 63 78 78
Duplicate Lines:
60 60 78 78
Attempted Code:
echo "60 60 61 64 63 78 78" | sed 's/ /\n/g' | uniq -D | tail -1
Current Result:
78
Expected Result:
60 78
Solution
You may try this gnu awk
solution:
s='60 60 61 64 63 78 78'
awk -v RS='[[:space:]]+' '++fq[$0] == 2' <<< "$s"
60
78
To avoid getting line breaks after each line:
awk -v RS='[[:space:]]+' '++fq[$0] == 2 {printf "%s", $0 RT}' <<< "$s"
60 78
Answered By - anubhava