Andrew Hemmert wrote:
> I am trying to edit sw/etc/apt/sources.list to add some lines.  I want 
> to install the packages ccp4, coot, and cns, and according to the 
> Crystallography on OS X wiki I need to edit that file.  I have tried 
> to chmod 777, I get Operation not permitted.  Can anyone give me some 
> advice on how to do this?  I am new at this.
> Thanks,
>
> Andy Hemmert
> Graduate Student
> Redinbo Lab
> Department of Biochemistry and Biophysics
> University of North Carolina - Chapel Hill
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
>
>
>
Don't chmod the file, but instead preface your editor command with 
"sudo", e.g.

sudo pico /sw/etc/apt/sources.list

You need to be an administrative user, and when it asks your password, 
just enter your user password. 

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