On one line

  case $HOSTNAME in Host1) echo Hello1 ;; Host2) echo Hello2 ;; *) echo Default;; esac
  case `hostname` in Host1) echo Hello1 ;; Host2) echo Hello2 ;; *) echo Default;; esac

In a script

  case $HOSTNAME in
    Host1)
      echo Hello1
      ;;
    Host2)
      echo Hello2
      ;;
    Host3 | Host4)
      echo Hello3&4
      ;;
    Host5|Host6)
      echo Hello5&6
      ;;
    "Host 7"|"Host 8")
      echo Hello7&8
      ;;
    *)
      echo Default hostname
      ;;
  esac

Comments before the ;; does not work. This

echo Hello # echoing Hello ;;

does not work. Do

echo Hello ;; # echoing Hello

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