[原创]比较两个文本文件的程序

cat dfile1
#!/bin/ksh
#scriptname:dfile

function Usage {
echo "Usage: dfile [-x|-y|-z] file1 file2"
}
(($# != 3 )) && { Usage; exit 1; }
for i in $(cat $2);do
      for j in $(cat $3);do
      echo $i $j
      done
done>a$$
#same=$(awk '$1==$2 {print $1}' a$$ )
same=$(awk '$1==$2 {print $1}' a$$|uniq)
X=$(echo 两个文件相同的行是:
echo $same|tr ' ' '\n')

#diff1=$(awk '$1 != $2 {print $1}' a$$|uniq -d )
all1=$(awk ' {print $1}' a$$|uniq )
Y=$(echo "文件$2中存在而文件$3中不存在的行是:"
echo $same $all1|tr ' ' '\n'|sort|uniq -u
echo "\n"

for n in $(cat $3);do
      for m in $(cat $2);do
      echo $n $m
      done
done>b$$
#diff2=$(awk '$1 != $2 {print $1}' b$$|uniq -d )
all2=$(awk '{print $1}' b$$|uniq )
Z=$(echo "在文件$3中存在而文件$2中不存在的行是:"
#echo -n $diff2 $same|tr ' ' '\n'|sort|uniq -u
echo $all2 $same|tr ' ' '\n'|sort|uniq -u
echo "\n"

while getopts

yz: arg
do
      case $arg in
      x)    echo $X|tr ' ' '\n';;
      y)    echo $Y|tr ' ' '\n';;
      z)    echo $Z|tr ' ' '\n';;
      \?)    echo "选项错误!!!";Usage;;
      esac
done
rm a$$ b$$

我把程序改了一下，因为你这个程序在a.txt 为1行：a且b.txt为1行：b时
程序无法识别