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I don't understand!

First, please use code tags around the file contents; not around the contents AND the descriptions of the contents.

Second, are you saying that your input files contain code...

Jotne and elixir_sinari both seem to have missed that jothi basu asked not only for a "1" to be added but also for "T" to be changed to "t". And since "Test" always appears at the start of lines to...

May be:
sed '/^#/!s/Test/&1/g' file

With awk
awk '!/^#/ {sub(/Test/,"Test1")}1' infile

Please use code tags

Try this if the input file pattern is what you have mentioned
sed 's/\([A-Z]\)_\([A-Z]\)/\1.\2/g' infile

--ahamed

Looking for something like this?
#!/bin/bash
array=( cat dog horse )

a="horse"

for x in ${array[@]}
do
if [ "$a" == "$x" ]
then
echo "$a and $x match"
else
...