Shell Programming and Scripting

Hi all

I have two files X.txt and Y.txt. Both file contains same number of sentences. The content of X.txt is

Code:

The filter described above may be combined.

and the content of Y.txt is

Code:

The filter describ+ed above may be combin+ed.

Some of the words are separated with "+" symbol.
Some of the words are equal and some not.

The expected output is :

Code:

The|The|empty filter|filter|empty described|describ+ed above|above|empty may|may|empty be|be|empty combined|combin+ed.

For any matching word in the corresponding location of the corresponding sentences, the same word is copied and suffixed with the word "empty" with a "|" separation. But for unmatched word, print the words from X and Y separated by "|".

I want to write a Perl script. Any help is appreciated.
Thanks in advance.

By Awk

Code:

$ awk 'NR==FNR {for (i=1;i<=NF;i++) a[NR FS i]=$i} 
          NR>FNR {for (i=1;i<=NF;i++) {(a[FNR FS i]==$i)?t="|empty":t="" ; printf "%s|%s%s ",a[FNR FS i],$i,t}} 
                      {print ""}' X.txt Y.txt

The|The|empty filter|filter|empty described|describ+ed above|above|empty may|may|empty be|be|empty combined.|combin+ed.

Thanks rdcwayx. It worked.