In Bash, how to add “Are you sure [Y/n]” to any command or alias?

Question

In this particular case, I\'d like to add a confirm in Bash for

Are you sure? [Y/n]

for Mercurial\'s hg push ssh://username@www.example.com//some

Answer 1

Try,

 #!/bin/bash
 pause ()
 {
 REPLY=Y
 while [ "$REPLY" == "Y" ] || [ "$REPLY" != "y" ]
 do
  echo -e "\t\tPress 'y' to continue\t\t\tPress 'n' to quit"
  read -n1 -s
      case "$REPLY" in
      "n")  exit                      ;;
      "N")  echo "case sensitive!!"   ;; 
      "y")  clear                     ;;
      "Y")  echo "case sensitive!!"   ;;
      * )  echo "$REPLY is Invalid Option"     ;;
 esac
 done
 }
 pause
 echo "Hi"