Shell Programming and Scripting

1       2       3       27      28
2       3       4       28      29
3       4       5       29      30
4       5       6       30      1
5       6       7       1       2

#!/bin/sh

for (( ; ; ))
do
        for num in {0..26}
        do
                echo $num
                expr $num + 1
                expr $num + 2
                expr $num + 3
                expr $num + 4

        sleep 10
        done
done

typeset -i aiNum[1]=0
typeset -i aiNum[2]=1
typeset -i aiNum[3]=2
typeset -i aiNum[4]=26
typeset -i aiNum[5]=27
typeset -i iArrCnt=1

while <some-termination-condition> ; do
     (( iArrCnt = 1 ))
     while [ $iArrCnt -le 5 ] ; do
          if [ ${aiNum[$iArrCnt]} -lt 30 ] ; then
               (( ${aiNum[$iArrCnt]}++ ))
          else
               (( ${aiNum[$iArrCnt]} = 1 ))
          fi
          echo -n "${aiNum[$iArrCnt]}   "
     done
     echo " "
done

num=-1
while (:)
        do ((num++))
           echo -e $((num%30+1)) "\n" $(((num+1)%30+1)) "\n" $(((num+2)%30+1)) "\n" $(((num+3)%30+1)) "\n" $(((num+4)%30+1))
           sleep 1
        done