#!/usr/bin/ksh
IFS=','
set -A mL1 $(sed -n '1s/ //gp' File)
set -A mL2 $(sed -n '$s/ //gp' File)
typeset -i mI=0
while [[ ${mI} -lt ${#mL1[*]} ]]; do
if [[ "${mL1[$mI]}" != "" ]]; then
mOut=${mOut}','${mL1[$mI]}
else
mOut=${mOut}','${mL2[$mI]}
fi
mI=${mI}+1
done
IFS=''
echo ${mOut} | sed 's/,//'