I think you may be confusing "catenate" with "concatenate". Catenating one
file is perfectly valid.

"Warp" <war### [at] tagpovrayorg> wrote in message
news:3f672364@news.povray.org...
> Christoph Hormann <chr### [at] gmxde> wrote:
> > cat mesh2.pov | head -n 17361 | tail -n `expr 17361 - 8605`
>
>   Useless use of cat...
>   'cat' is a command for catenating files (the counterpart of 'split').
> Catenating one file with nothing makes no sense at all.
>
>   The good-style way of doing it is:
>
> head -n 17361 mesh2.pov | tail -n `expr 17361 - 8605`
>
>   However, that command still has useless junk. You can do it like this:
>
> head -17361 mesh2.pov | tail +8756
>
> (if you want to keep the calculation, you can do it more efficiently like
> this, at least in zsh:
> head -17361 mesh2.pov | tail +${17361-8605}
> )
>
>
> -- 
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -

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