!/bin/bash
# this script creates an outfile with "val" number of lines of   digits with the columns aligned ...
# but formating only works to 999 so far , but its eay to extend,
#  WARNING: you will still need to edit the outfile to add or remove ...
#        since this script cant perfectly write  to 64,128,256,512... and such
# mike , undergrad, friday,4th,2011.
# hope it makes your work easier!!


if [ $# -eq 0 ]
then
   echo " "
fi

myarray=(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20)
count=0
n=0
val=25                  #change this to the number of lines you want ie if 1..50 , val~3 since there are
                        # roughly five  lines of digits

echo -n " even or odd ? "
read -e TYPE
 if [ "$TYPE" =  "even" ]
  then let  type=2
  else let  type=1
 fi

tens=99
hundreds=999            #you would need to add other variables like t...r than 999

i=0
if [ "$type" -eq 2 ]; then    ###########      for the even list of digits

 echo >> outfile$type
 for i in ${myarray[@]}
           do
        if (( ("$i" % 2) ==  "0" )); then
           sed '$s/$/ '$i'/' -i outfile$type
          # echo $i
           if   [ "${myarray[$i]}" -gt  "10" ] ; then
               sed '$s/$/  /' -i outfile$type
           else   sed '$s/$/   /' -i outfile$type   #his adjusts the space betw....the forward slashes
           fi
        fi
           done
  echo >> outfile$type
  while [ $n -le $val ]
   do
        for i in ${myarray[@]}
           do
            myarray[$count]=`expr $i + 20`
            ((count++))
           done
         count=0


       for i in ${myarray[@]}
           do
         if (( ("$i" % 2) == "0" )) ; then          # check if its odd or even
           sed '$s/$/ '$i'/' -i outfile$type
              if [ "${myarray[0]}" -le "$tens" ] ; then
                  sed '$s/$/  /' -i outfile$type         # adjusts space betwe...the ones digits

                elif [ "${myarray[0]}" -le "$hundreds" ]; then
                 sed '$s/$/ /' -i outfile$type           #this adjusts........igned with the ones & tens

                         #ld add such elifs from here to... extend the column alignment beyond 999
               else
                 sed '$s/$/ /' -i outfile$type            #adjusts space after hundreds
              fi
         fi
           done
           echo >> outfile$type

         let n++
  done



else                                          ## for odd numbers

echo >> outfile$type
 for i in ${myarray[@]}
           do
        if (( ("$i" % 2) !=  "0" )); then
           sed '$s/$/ '$i'/' -i outfile$type
           if  [ "${myarray[$i]}" -gt  "10" ]; then
               sed '$s/$/  /' -i outfile$type
           else   sed '$s/$/   /' -i outfile$type   #s adjusts the space between the ones dig...ashes
           fi
        fi
           done

  echo >> outfile$type

  while [ $n -le $val ]
   do

        for i in ${myarray[@]}
           do
            myarray[$count]=`expr $i + 20`
            ((count++))
           done
         count=0


       for i in ${myarray[@]}
           do
         if (( ("$i" % 2) != "0" )) ; then          #    check if its odd or even
           sed '$s/$/ '$i'/' -i outfile$type
              if [ "${myarray[0]}" -le "$tens" ] ; then
                sed '$s/$/  /' -i outfile$type       # adjusts space between the tens...be               elif [ "${myarray[0]}" -le "$hundreds" ]; then
                 sed '$s/$/ /' -i outfile$type           #...ds digits to be aligned with the ones & ...

                         # you would add such elifs from here to extend the........
               else
                 sed '$s/$/ /' -i outfile$type            # adjusts space after hundreds
              fi
         fi
           done
           echo >> outfile$type

         let n++
  done
fi









this is the error message thought the script does what its intended to do:


 ./Onetofive: line 40: [: : integer expression expected

funny thing is that it only gives the error message when i choose the "even"
choice , but still does what its intended, the "odd" does not give any error message

i'v highlighted line 40