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

  [ "`/usr/bin/id -u 2>/dev/null || echo 0`" -le 200 ] && return

  # for bash and zsh, only if no alias is already set

  alias vi >/dev/null 2>&1 || alias vi=vim

fi