Shell Programming and Scripting

f1.log - There is a difference in the f1 and f2, please find the below difference:
......
f2.log - No difference found
f3.log - No difference found
Additional.log - There is additional file in D2 with filename as f4

diff -rs a b |  awk -F"[: \t]" '
        /^diff/ {
                N=split($3, A, "/");    N=A[N]".log"

                print "difference between " $3, $4 >> N
                getline ; getline

                while(/^[<>-]/) { print >> N ; if(getline != 1) break }

                close(N)
        }

        /^Only in/ {
                N=split($3, A, "/");    N=A[N]".log"
                print "There is additional file in "$3" with filename as "$NF >N
                close(N)
        }

        /identical$/ {
                N=split($2, A, "/");    N=A[N]".log"
                print A[N] " - no difference found" >> N
                close(N)
        }'