#!/bin/ksh
# Script name: readit
# Example 10.75

if [ $# != 2 ] ; then
   print \
   "Usage: $(basename $0 ) filename filename" \
   1>&2
   exit 1
fi

while read -u3 line1 && read -u4 line2
do
   print "$line1:$line2"
done 3<$1 4<$2