[Solved] grep values and re-arranging the file

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Try this awk:

awk -F'"' 'NR%2{p1=$4;next} {print p1 "https://stackoverflow.com/" $4}'

Test:

$ awk -F'"' 'NR%2{p1=$4;next} {print p1 "https://stackoverflow.com/" $4}' file
abc/123abc
bac/bac123
cde/cd123
b4u/b4u234

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solved grep values and re-arranging the file