incognito shell function

incognito.sh

#!/bin/bash
incognito() {
  if [[ -z ${SHELL} ]]; then
    echo "Could not determin shell.\nUsing /bin/bash"
    SHELL=bash
  fi
  case "${SHELL}" in
    *bash)
      set -o history
      ;;
    *zsh)
      HISTFILE=/dev/null
      ;;
    *)
      echo "Shell not supported"
      exit 2
      ;;
  esac
}
incognito