Don't even need cat
simply do

grep PPC ref.pdb > tar_i.pdb

redirecting std out with > appends it directly to the file (after the 
last line)

Cheers

On 9/5/14 6:48 PM, James Starlight wrote:
> Dear Pymol users!
>
> I've decided to open new topic focused on the implementation of the
> common shell utilities like grep awk and sed for the structural
> bioinformatics tasks like processing and editing of the large sets of pdbs.
>
> In my current task I need to copy all lipids from one pdb (called it
> ref) to another call it tar_i.pdb (both files have the same 3D shape and
> have been superimposed before that): so in that case I guess lipids
> could be recognized by residue name in pdb file (PPC) as well as by its
> #4 column number (what is actually do grep).  So the algorithm might be:
> select from the ref.pdb all strings where #4 column is PPC and merge it
> (by means of CAT I guess) with the tar_i.pdb. Please show me some
> example of the one-line method of this realization.
>
> Thanks,
>
> James
>
>
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-- 
Gianluca Santoni,
Dynamop Group
Institut de Biologie Structurale
6 rue Jules Horowitz                                                    
38027 Grenoble Cedex 1                                          
France  
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