#!/bin/bash
################# this script creates an outfile with "val" number of lines of   digits with the columns aligned . val can be set to what you want
################# 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 the final last digits to the desired final number
#################        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 this to extend column alignment to greater 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$type   ######this adjusts the space between the ones digits , space is added or removed bbetween the forward slashes
           fi
        fi
           done
  echo >> outfile$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         ######### this adjusts space between the tens digits to be aligned with the ones digits

                elif [ "${myarray[0]}" -le "$hundreds" ]; then
                 sed '$s/$/ /' -i outfile$type           ######### this adjusts the space between the hundreds digits to be aligned with the ones & tens

                         ######## you would 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   ######this adjusts the space between the ones digits , space is added or removed bbetween 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         ######### this adjusts space between the tens digits to be aligned with the ones digits

                elif [ "${myarray[0]}" -le "$hundreds" ]; then
                 sed '$s/$/ /' -i outfile$type           ######### this adjusts the space between the hundreds digits to be aligned with the ones & tens

                         ######## you would 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
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


here is what it gives with "set -x"

+ ./Onetofive

 even or odd ? even
./Onetofive: line 40: [: : integer expression expected
++ echo -ne '\033]0;mike@localhost:~/work/worksub/scripts'




+ for i in '${myarray[@]}'
+ ((  (15 % 2) ==  0  ))
+ for i in '${myarray[@]}'
+ ((  (16 % 2) ==  0  ))
+ sed '$s/$/ 16/' -i outfile2
+ '[' 17 -gt 10 ']'
+ sed '$s/$/  /' -i outfile2
+ for i in '${myarray[@]}'
+ ((  (17 % 2) ==  0  ))
+ for i in '${myarray[@]}'
+ ((  (18 % 2) ==  0  ))
+ sed '$s/$/ 18/' -i outfile2
+ '[' 19 -gt 10 ']'
+ sed '$s/$/  /' -i outfile2
+ for i in '${myarray[@]}'
+ ((  (19 % 2) ==  0  ))
+ for i in '${myarray[@]}'
+ ((  (20 % 2) ==  0  ))
+ sed '$s/$/ 20/' -i outfile2
+ '[' '' -gt 10 ']'
Onetofive: line 40: [: : integer expression expected
+ sed '$s/$/   /' -i outfile2
+ echo
+ '[' 0 -le 5 ']'



everything seems to go ok until ${myarray[@]} seems to evaluate to an empty ''  how does does that happen? and why just for "even" the array just has digits 1..20