Este é um script do "sobrenatural" Júlio César Neves. Veio no CD de exemplos do excelente livro Programando em Shell Script.

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#!/bin/sh
#
#######################################################
#                   JOGO DA VELHA                     #
#          DUVIDO QUE VOCE CONSIGA GANHAR!            #
#-----------------------------------------------------#
#                    TIC TAC TOE                      #
#    I WON'T GIVE YOU A CHANCE. YOU'LL NEVER WIN!     #
#######################################################
#                                                     #
#         Leia:    Programacao Shell - Linux          #
#         Autor:   Julio Cezar Neves                  #
#         Editora: Brasport                           #
#         ISBN:    85-7452-076-4                      #
#                                                     #
#######################################################
#  Para qualquer duvida ou esclarecimento sobre este  #
# programa estou as ordens em julio.neves@bigfoot.com #
#-----------------------------------------------------#
#   Any doubt about this program you can find me at   #
#              julio.neves@bigfoot.com                #
#######################################################
# Se voce estiver sob o bash, troque a 1a. linha por  #
#                    #!/bin/bash                      #
#-----------------------------------------------------#
#   If you are running bash change the 1st. line for  #
#                    #!/bin/bash                      #
#######################################################
#    Este foi um meio divertido que encontrei para    #
#  testar a compatibilidade no uso de arrays entre o  #
# bash e o ksh. Se alguem quiser desenvolver a rotina #
#   em que o adversario comeca jogando, sinta-se a    #
#  vontade, porem nao esqueca de mandar-me o modulo   #
#             para incorpora-lo ao meu.               #
#-----------------------------------------------------#
#  This program was developed as a funny way to test  #
#  the compatibility between arrays in ksh and bash.  #
# Feel free for develop the module that the opponent  #
# start playing, but don't forget to send me the new  #
#     routine because I'll attach it at this one.     #
#######################################################
#

Ganhei=0
Empate=0
Bold=`tput bold`
OBold=`tput sgr0`
Cols=`tput cols`
if   [ $Cols -lt 80 -o `tput lines` -lt 25 ]
then
    clear
    echo "O tamanho minimo da janela deve ser 25 linhas e 80 colunas"
    exit 2
    read lixo
fi
Col0=`expr \( $Cols - 46 \) / 2`
Eng=`echo "To play in english use: $Bold\`basename $0\`$OBold -e (default language is portuguese)"`

# Ingles ou Portugues?             English or Portuguese?
if  [ "$1" = -e ]
then
        StrIni[1]="   1   2   3"
        StrIni[2]="1    |   |              +---------+----------+"
        StrIni[3]="  ---+---+---           |  Ties   |   Wins   |"
        StrIni[4]="2    |   |              +---------+----------+"
        StrIni[5]="  ---+---+---           |         |          |"
        StrIni[6]="3    |   |              +---------+----------+"
   StrGan="I   W O N !!!"
   StrEmp="T I E"
   StrLe="Now it's our time to play (RowColumn):"
   StrEr1="At this position already has a -> "
   StrEr2="Write row and column together. I.E. 13 means row 1 and column 3"
   StrFim="Do you want to continue?"
else
        StrIni[1]="   1   2   3"
        StrIni[2]="1    |   |              +---------+----------+"
        StrIni[3]="  ---+---+---           | Empates | Vitorias |"
        StrIni[4]="2    |   |              +---------+----------+"
        StrIni[5]="  ---+---+---           |         |          |"
        StrIni[6]="3    |   |              +---------+----------+"
   StrGan="G A N H E I !!!"
   StrEmp="E M P A T E"
   StrLe="Informe a sua jogada (LinhaColuna):"
   StrEr1="Nesta posicao ja existe um -> "
   StrEr2="Informe Linha e Coluna juntos. Ex: 13 = Linha 1 e Coluna 3"
   StrFim="Deseja continuar?"
fi

Escrever ()
   {
        ColIni=`expr \( $Cols - length "$2" \) / 2`
   tput cup $1 $ColIni
   echo "$2"
   }
Iniciar ()
   {
   Jogo=
   for i in 1 2 3
   do
      for j in 1 2 3
      do
         P[$i$j]=
      done
   done
   clear
   for i in 1 2 3 4 5 6
   do
      tput cup `expr 11 + $i` $Col0
      echo "${StrIni[i]}"
   done
   Seg=`date "+%S"`
   case `expr $Seg % 5` in
      0) Jogo=11 ; Saida=1 ;;
      1) Jogo=13 ; Saida=2 ;;
      2) Jogo=31 ; Saida=3 ;;
      3) Jogo=33 ; Saida=4 ;;
      *) Jogo=22 ; Saida=5 ;;
   esac
   tput cup 16 `expr $Col0 + 29`
   echo $Bold$Empate
   tput cup 16 `expr $Col0 + 40`
   echo $Ganhei$OBold
   }
Jogar ()
   {
   P[$1]=$2
   Lin=`echo $1 | cut -c1`
   Col=`echo $1 | cut -c2`
   Lin=`expr \( $Lin - 1 \) \* 2 + 13`
   Col=`expr \( $Col - 1 \) \* 4 + 3 + $Col0`
   tput cup $Lin $Col
   echo $2
   }
Placar ()
   {
   tput bold
   if  [ $1 = E ]
   then
      Empate=$((Empate+1))
      tput cup 22 $Col0
                echo "$StrEmp"
      tput cup 16 `expr $Col0 + 29`  # Escrevendo Placar
      echo $Empate
   else
      Ganhei=$((Ganhei+1))
      tput cup 22 $Col0
                echo "$StrGan"
      tput cup 16 `expr $Col0 + 40`  # Escrevendo Placar
      echo $Ganhei
      case $2 in
      L)   for j in 1 2 3
         do
            Jogar $i$j X
         done
         ;;
      C)   for j in 1 2 3
         do
            Jogar $j$i X
         done
         ;;
      D1)   for i in 11 22 33
         do
            Jogar $i X
         done
         ;;
      *)   for i in 13 22 31
         do
            Jogar $i X
         done
      esac
   fi
   tput sgr0
   }

# Cuidado com o chefe!             WARNING! The boss is near you!
trap "clear ; exit" 0 2 3


# Jogando                          Playing
while true
do
   Iniciar
   if  [ "$1" != "-e" ]
   then
#      tput cup 3 23
      Escrever 3 "$Eng"
   fi
   Jogar $Jogo X
   Vez=0
   while true
   do
      if [ $Vez -eq 4 ]
      then
         Placar E
         break
      fi
      tput cup 21 $Col0
      echo "$StrLe"
      tput cup 21 `expr $Col0 + 1 + length "$StrLe"`
      tput el
      tput cup 21 `expr $Col0 + 1 + length "$StrLe"`
      read Jogo
      case $Jogo in
      [1-3][1-3])   if  [ ${P[$Jogo]} ] 
            then
               tput cup 22 $Col0
               echo -n "$Bold$StrEr1${P[$Jogo]} <-$OBold"
               read Jogo
               tput cup 22 $ColIni
               tput el
                              tput cup 21 `expr $Col0 + 1 + length "$StrLe"`
               tput el
               continue
            fi
            Jogar $Jogo O
            Vez=$((Vez+1))
            ;;
          *)   tput cup 22 $Col0
                  echo -n "$Bold$StrEr2$OBold"
                  read Jogo
            tput cup 22 $Col0
            tput el
                      tput cup 21 `expr $Col0 + 1 + length "$StrLe"`
            tput el
                  continue
      esac

      for i in 1 2 3
      do
         LX[i]=0 ; CX[i]=0 ; LO[i]=0 ; CO[i]=0 ; DX[i]=0 ; DO[i]=0
      done
      
      for i in 1 2 3
      do
         for j in 1 2 3
         do
            [ "${P[$i$j]}" = X ] && LX[i]=$((${LX[$i]}+1))
            [ "${P[$i$j]}" = O ] && LO[i]=$((${LO[$i]}+1))
            [ "${P[$j$i]}" = X ] && CX[i]=$((${CX[$i]}+1))
            [ "${P[$j$i]}" = O ] && CO[i]=$((${CO[$i]}+1))
         done
      done
      for i in 11 22 33
      do
         [ "${P[$i]}" = X ] && DX[1]=$((${DX[1]}+1))
         [ "${P[$i]}" = O ] && DO[1]=$((${DO[1]}+1))
      done
      
      for i in 13 22 31
      do
         [ "${P[$i]}" = X ] && DX[2]=$((${DX[2]}+1))
         [ "${P[$i]}" = O ] && DO[2]=$((${DO[2]}+1))
      done

# Pra ganhar                       I wanna win!

      for i in 1 2 3
      do
         LAlinhadas[i]=$((${LX[i]}-${LO[i]}))
         CAlinhadas[i]=$((${CX[i]}-${CO[i]}))
         DAlinhadas[i]=$((${DX[i]}-${DO[i]}))
         if  [ ${LAlinhadas[i]} -eq 2 ]
         then
            for j in 1 2 3
            do
               [ ${P[$i$j]} ] && continue
               Jogo=$i$j
               Jogar $Jogo X
               Placar G L
               break 3
            done
         fi
         if  [ ${CAlinhadas[i]} -eq 2 ]
         then
            for j in 1 2 3
            do
               [ ${P[$j$i]} ] && continue
               Jogo=$j$i
               Jogar $Jogo X
               Placar G C
               break 3
            done
         fi
      done
      if  [ ${DAlinhadas[1]} -eq 2 ]
      then
         for i in 11 22 33
         do
            [ ${P[$i]} ] && continue
            Jogo=$i
            Jogar $Jogo X
            Placar G D1
            break 2
         done
      fi
      if  [ ${DAlinhadas[2]} -eq 2 ]
      then
         for i in 13 22 31
         do
            [ ${P[$i]} ] && continue
            Jogo=$i
            Jogar $Jogo X
            Placar G D2
            break 2
         done
      fi

# Pra nao perder                   I don't wanna lose
      
      for i in 1 2 3
      do
         if  [ ${LAlinhadas[i]} -eq -2 ]
         then
            for j in 1 2 3
            do
               [ ${P[$i$j]} ] && continue
               Jogo=$i$j
               Jogar $Jogo X
               continue 3
            done
         fi
         if  [ ${CAlinhadas[i]} -eq -2 ]
         then
            for j in 1 2 3
            do
               [ ${P[$j$i]} ] && continue
               Jogo=$j$i
               Jogar $Jogo X
               continue 3
            done
         fi
      done
      if  [ ${DAlinhadas[1]} -eq -2 ]
      then
         for i in 11 22 33
         do
            [ ${P[$i]} ] && continue
            Jogo=$i
            Jogar $Jogo X
            continue 2
         done
      fi
      if  [ ${DAlinhadas[2]} -eq -2 ]
      then
         for i in 13 22 31
         do
            [ ${P[$i]} ] && continue
            Jogo=$i
            Jogar $Jogo X
            continue 2
         done
      fi

# Ao ataque!                       Let's attack!

      case $Vez in
         1)  case $Saida in
               1)  [ ${P[33]} ] && Jogo=13 || Jogo=33 ;;
               2)  [ ${P[31]} ] && Jogo=33 || Jogo=31 ;;
               3)  [ ${P[13]} ] && Jogo=11 || Jogo=13 ;;
               4)  [ ${P[11]} ] && Jogo=31 || Jogo=11 ;;
               *)  if  [ ${P[11]} ]
                  then
                     Jogo=33
                  elif [ ${P[33]} ]
                  then
                     Jogo=11
                  elif [ ${P[13]} ]
                  then
                     Jogo=31
                  else
                     Jogo=13
                  fi
             esac ;;
         *)  [ $P{[22]} ] &&
            {
               Jogo=
               for i in 1 3
               do
                  for j in 1 3
                  do
                     [ ${P[$i$j]} ] && 
                     {
                        [ ${P[$j$i]} ] && continue || 
                        {
                           Jogo=$j$i
                           break 2
                        }
                     } ||
                     {
                        Jogo=$i$j
                        break 2
                     }
                  done
               done
               [ "$Jogo" ] && 
               {
                  Jogar $Jogo X
                  continue
               }
               for i in 1 2 3
               do
                  for j in 1 2 3
                  do
                     [ "${P[$i$j]}" ] && continue
                     Jogo=$i$j
                     break 2
                  done
               done
            } || Jogo=22
      esac
      Jogar $Jogo X
   done
   tput cup 23 $Col0
        echo "$StrFim"
   tput cup 23 `expr $Col0 + length "$StrFim" + 1`
   read a
   [ `echo $a | tr n N` = N ] && exit
done

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