to include a piece of code in existing unix script

I have a filewatcher.txt file . i want to include a piece of code in an existing unix script(final) that will ask user for input(Y/N) to check 开发者_如何学Pythonwhether the file has been renamed(*filewatcher.txt e.g.SAV_filewatcher.txt or xyz_filewatcher.txt ) or the original name(filewatcher.txt) exists. If the file watcher has not been renamed the existing code(final) will exit.

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I'm not positive I understand what you're looking to do, but here are a few basic scripting tips:

if [ -f "filewatcher.txt" ]; then
  echo "file has not been renamed"
fi

echo "Please give me some input"
read var
echo "Your input was $var"