for i in $(`ls -1) ; do echo $i; done


# generate 01-12 numbers with jot
# and use wget to get the files
# if they don't exit (-nc) 
for i in `jot -w '%.2u' 12`; 
do 
  wget -nc http://www.example.com/r/r2005$i.pdf ; 
done

To get each line of a file into a variable iteratively do:
{ while read myline;do
   # process $myline
done } < filename

To catch the output of a pipeline each line at a time in a variable use:
last | sort | {
while read myline;do
   # commands
done }

### ksh check if variable was defined
if [[ -z $1 ]]; then
        print "usage: $0 option1"
        return 1
fi
MYVARIABLE=$1

### ksh arrays
set -A myarray 1 10 30 50 70 90 100 111 100
for n in "${myarray[@]}"
do
   echo "myarray = $n"
done



http://www.well.ox.ac.uk/~johnb/comp/unix/ksh.html
http://docstore.mik.ua/orelly/unix/ksh/ch05_01.htm