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Re: Not so useless use of cat

From: Ralf Goertz
Subject: Re: Not so useless use of cat
Date: Tue, 16 Sep 2014 09:03:20 +0200

Am Sat, 13 Sep 2014 12:53:48 -0600
schrieb Bob Proulx <address@hidden>:

> Dennis Williamson wrote:
> > Bob Proulx wrote:
> > >   { for i in file[12] ; do cat "$i" ; done ;} > both

> > There's no need for the curly braces and the last semicolon.
> Of course you are totally right.  I was distracted by the subshell as
> a concept.  For re-stitching file with redirections a subshell isn't
> needed and a list is convenient.
> > Note that the loop in this case can be replaced by
> > 
> > cat file[12] > both
> > 
> > I failed to spot that in my earlier reply.
> Me too.  (But usually these are from more complex examples that can't
> be simplified as much.  It is just that all of the details aren't
> shown.)

Actually things are more complicated. I do need the /dev/stdout part. I
obiously don't have the problem with `cat' but with some other program
that doesn't write to stdout per se and expects a -o parameter for the
output file. And this program just accepts one input file. I merely used
the first `cat' in my example to make my point. So what I wanted was

$ for i in file[12] ; do program -i "$i" -o /dev/stdout ; done > outfile

which I assumed to be elegant and would do as I expected except it
didn't and I really thought it could have been a bug. That's why I
reported it here.

Thanks for all replys,


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