changes made to a file are also made in his copy

[angelo.moreschini at medident-sw.it]

Hi,

I apologize for a trivial question but that's because I yet have not much experience with Linux. 

I made, some time ago, a copy of the smb.conf file, for security reasons, before making to it any changes: 
(cp smb.conf.original smb.conf.original.orig )

Yesterday I wanted to give a look at the contents of the old file(smb.conf.original) that I had copied; but I found that both files have the same content. 

I made other changes, in order to do experiments, and I have always seen that the changes made to a file are always shown on the other file. 

The command "ls -l" shows the two files are colored blue which (I think) indicates that the files are a link to each other. 

Since I am convinced that I used the "cp" command; my question is: 
which mistake can I have made ​​to create a  link of the file instead of a copy of it?

Thank you

Regards

Angelo
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