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Rather than using the cut utility, the shell builtin read could be used i.e.

for file in *; do
read -r -n 3 ext < ${file}
mv ${file} ${file}_${ext}
done

About 10 years ago I was in a similar situation and age like you are, had 95% only worked with Windows servers and clients and had just made my MCSE. I switched my job to a AIX and Linux environment...

Not sure I understand correctly, but if you want to remove all elements from the array that match / contain $3, try (with your new sample code):

awk '
function RMDUP(P1, T, TX, DL) {for (n =...

Howsoever, how far would
awk '
function RMDUP(P1, T, TX, DL) {for (n = split (P1, TMP, ","); n; n--) T[TMP[n]]
for (t in T) {TX = TX DL t
...