Shell Programming and Scripting

#!/bin/bash

loop()
{
   for((${1}=0; ${1}<${2}; ++${1})); do
        eval \$\{{3..12}\}
   done
}

numb()
{
   echo -n "${!1}${!2}${!3} "
   (( ${3} == 2 )) && echo
}

eval loop" "{i..k}" 3" numb {i..k}

$ ./unknown.sh

000 001 002
010 011 012
020 021 022
100 101 102
110 111 112
120 121 122
200 201 202
210 211 212
220 221 222

$

echo {0..2}{0..2}{0..2} | xargs -n 3

for((i=0; i<3; ++i)); do
   for((j=0; j<3; ++j)); do
      for((k=0; k<3; ++k)); do
          echo -n "${i}${j}${k} "
          (( k == 2 )) && echo
      done
   done
done

#!/bin/bash

set -- A B C D E

while [ "$X" != "Z" ]
do
        [ "$X" = $1 ] && printf "\t"

        for X in $*
        do
                printf "%d" "${!X}"
        done

        for X in $* Z
        do
                [ $X = $2 ] && echo
                (($X=(++$X % $#))) && break
        done
done