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Try: awk 'BEGIN{"date +%d/%m/%y"|getline d}NR==1{$3=$3" today"}NR==2{$3=$3" =="}NR>2{$3=$3" "d}1' file

Here is a brief explanation:
awk '
# Skip first two records of input file
NR > 2 {
# Set variable V = $0 (current record)
V = $0
...

Change
print A[T[n]], T[n], "IS DUPLICATE OF \"" M[T[n]], T[n] "\""
To
print T[1], T[n], "IS DUPLICATE OF \"" M[T[n]], T[n] "\""

awk '
NR > 2 { # Skip first 2 lines
n = $1 # Set n = 1st field
# Substitute every...