if [ -n "${BASH_VERSION-}" -o -n "${KSH_VERSION-}" -o -n "${ZSH_VERSION-}" ]; then

  # This will avoid user defined aliases and possibly stuff defined earlier in the PATH.

  case "$(command -v vim)-$(command -v vi)" in

    /usr/bin/vim-/usr/bin/vi)

        # apply only when founded vim and vi are in expected dirs from distro

        alias vi=vim

        alias view="vim -R"

        ;;

    -/usr/bin/vi)

        # apply only if founded vi is in expected dir from distro

        alias vim="read -rep $'No vim found, using vi, press ENTER to continue\n' -n1 -t 20 -s && vi"

        ;;

  esac

fi