UNIX for Dummies Questions & Answers

I am writting a script where I have to Campare two text files.
I have 3 text files named by s_list, s_list_new and dmg_file. where I have to compare s_list and s_list_new and whatever the unique values are in s_list I have to add that in the dmg_file. And the values they are only in s_list_new and not in s_list I have to delete that from dmg_file
I have tried so many things, but diff, comm is not helping me because if i do comm it compares line by line and the value may not match line by line and with diff its not giving me exact output and I am thinking may be im not aware of different diff output formats.
for example if i do diff temp temp1 i get like this output and I dont want it. i just want thos unique values nothing else
diff temp temp1
1,5d0
< a
< 1
< 2
< 3
< 4
11c6,9
<
---
> 10
> 11
> 12
> 13

Any Help Plz
I will appreciate the help

Experiment with grep and fgrep (grep -f). Check out the man page for those options. Mix in a little "sort | uniq -u" and you should get something pretty workable.

Try with uniq command

cat temp temp1 | uniq