Press Enter to Continue
See this unix.stackexchange question
read -p "Press enter to continue"
# for any key to do
read -n 1 -s -r -p "Press any key to continue"Explanation by Rayne and wchargin
-n defines the required character count to stop reading
-s hides the user's input
-r causes the string to be interpreted "raw" (without considering backslash escapes)