Shell Programming and Scripting

for i in $(eval echo {1..$SLOT})
do                                                # print all elements of the array
  printf "%4d" ${Slots[$i]}    
done

galton.sh 12 100

   ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
   1   2   5   8  13  19   9  16  12   4   5   4   1
  |___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
                                          |   |

   ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
                    1   2   5   8  13  19   9  16  12   4   5   4   1
  |___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
                                          |   |

galton.sh 12 100 | awk -v col=$COLUMNS '{n_blank=(col-length($0))/2 ; printf "%-*s",n_blank," " ;print $0}'