awk Compare 2 files, print match and difference

Question

I need to comapre two files f1.txt and f2.txt and obtain matches, and non-matches, for this case I am looking to match first field on both files. And print first the second

Answer 1

This should do:

awk -F";" 'NR==FNR{a[$1]=$2;next}{if (a[$1])print a[$1],$0;else print "Not Found", $0;}' OFS=";" f2.txt f1.txt