primeiro-de-abril-foolbook.sh

#!/bin/bash
 
clear
 
while true; do
   read -p 'C:\>' cmd
   
   case $cmd in
      ver)
         echo -e "\nMS-DOS Version 6.22\n\n" ;;

      dir)
         echo \
'
 Volume in drive C is MS-DOS_6
 Volume Serial Number is 4A7F-8E5C
 Directory of C:\

DOS          <DIR>         04-01-17   5:50p
COMMAND  COM        54,645 04-01-94   6:22a
WINA20   386         9,349 04-01-94   6:22a
CONFIG   SYS            71 04-01-17   5:51p
AUTOEXEC BAT            78 04-01-17   5:51p
FOOLBOOK COM           666 04-01-17   5:51p
        6 file(s)         64,803 bytes
                     517,013,405 bytes free
'
         ;;

      cls)
        clear ;;

      foolbook)
        echo \
'*****************************************
*        FOOLBOOK v1.2 for DOS          *
*           by Mozó l33t0               *
*****************************************
'
        read -p 'Insira o FB ID: ' id
        echo -n "Obtendo a senha para o $id"
        for i in {1..3}; do
          sleep 1
          echo -n .
        done
        echo
        test $(($RANDOM % 2)) -eq 0 \
          && echo "ERRO: O ID $id está bloqueado contra este ataque" \
          || echo 'SUCESSO: Senha é hu3bolarato'
        ;;

      '')
         continue ;;
      *)  
         echo -e "Bad command or file name\n" ;;
   esac
done

Ainda bem que sei shellscript
Caio nessa não