Shell Programming and Scripting

i am working on a shell script and need help in the comparing part of it. for e.g. there two text files like this:

file1.txt

Code:

name1
name2
name3

file1 has to be comared with file2

defaultfile.txt

Code:

name1
name2
name3
name4

and during comparision with defaultfile.txt

if file1.txt contains conents of defaultfile, it should echo file authenticated

if file1.txt contains content which is not in defaultfile.txt, and it should echo file not authenticated....

i tried diff command but it doesnt seeem to help me

Moderator's Comments:

Please use code tags next time for your code and data.

What have you tried?
The commands

Code:

diff
comm

should be able to help you.

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