Bash Shell Scripting - detect the Enter key

Question

I need to compare my input with Enter/Return key...

read -n1 key
if [ $key == \"\\n\" ]
   echo \"@@@\"
fi

But this

Answer 1

read reads a line from standard input, up to but not including the new line at the end of the line. -n specifies the maximum number of characters, forcing read to return early if you reach that number of characters. It will still end earlier however, when the Return key is pressed. In this case, its returning an empty string - everything up to but not including the Return key.

You need to compare against the empty string to tell if the user immediately pressed Return.

read -n1 KEY
if [[ "$KEY" == "" ]]
then
  echo "@@@";
fi