急求，linux文件操作问题

我想实现的效果：有一个文件，将该文件的最后一行追加到每一行的末尾，awk或者sed都可以，求大神实现，急求

#用Python实现的代码
#coding=utf-8
from sys import argv
import sys

def main(argv):
file = open("D:\data.txt",'r')
lines = file.readlines()
file.close()
file = open("D:\data.txt",'w')
length = len(lines)
for row in range(length):
if row >= length - 1:
break
print lines[row]
file.write(lines[row].replace('\n','')+lines[length-1]+'\n')
file.close()

if name=="__main__":
main(sys.argv)

用python脚本实现容易

#!/bin/sh

INPUTFILE=$1
OUTPUTFILE=$2

for i in cat $INPUTFILE
do
echo -n ""
done

echo $i >> $OUTPUTFILE