Solaris

count=1
while [[ $count -lt 6 ]]
do
   echo "$count\c"  # on linux could be echo -n "$count"
   count=$(( count + 1 ))
done
echo ""

#!/bin/ksh
ID1=1234
ID2=2345
ID3=3456

count=1
while [ "$count" -lt "4" ]
do
        eval echo \$ID$count
        count=$((count + 1))
done

count=1
while [[ $count -lt 6 ]]
do
   printf  "ID%d=" $count
   for x in 0 1 2 3
   do
      value=$(( count + x )) 
      printf "%d" $value
   done
   count=$(( count + 1 ))
   printf "\n"
done