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X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date: Wed, 26 Nov 2003 10:42:58 -0500 (EST)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Ronald Landheer-Cieslak <blytkerchan AT users DOT sourceforge DOT net>
cc: cygwin AT cygwin DOT com
Subject: Re: newby stupid question - cat mutiple files to new piped output 
 files
In-Reply-To: <20031126115253.GI10265@linux_rln.harvest>
Message-ID: <Pine.GSO.4.56.0311261035350.1091@slinky.cs.nyu.edu>
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On Wed, 26 Nov 2003, Ronald Landheer-Cieslak wrote:

> On Wed, Nov 26, 2003 at 04:55:34AM -0500, c wrote:
> > Just started to get somewhere until i wanted to cat a heap of csv files and
> > then send the unique records to a new file.
> > I thought it couldnt be to hard but now my brain hurts.
> > Can anyone help me with a line of code that will do the command below
> > '$ cat d:/pc1/filename.csv |uniq > d:/pc1/newfilename.csv'
> > but i want it do it repeatidly for every .csv file in that directory?
> This has nothing to do with Cygwin, but hey..
>
> for i in /cygdrive/d/pc1/*.csv; do
> cat $i | uniq > /cygdrive/d/pc1/newfilename.csv
> done

Umm, surely you meant

	cat /cygdrive/d/pc1/*.csv | sort | uniq > /cygdrive/d/pc1/newfilename.csv

right?

Or, at the very least,

	for i in /cygdrive/d/pc1/*.csv; do
	  cat $i | uniq >> /cygdrive/d/pc1/newfilename.csv
	done

The goals of the OP weren't very clearly stated, so he might have wanted
to do

	for i in /cygdrive/d/pc1/*.csv; do
	  cat $i | uniq > /cygdrive/d/pc1/new$i.csv
	done

instead.

> This will work once, because the new files won't be there yet. After
> that, the *.csv will pick up the new files as well..
>
> Take a look at the "Advanced Bash scripting guide" which you can find at
> http://tldp.org for info on how to do this kind of thing correctly..
>
> HTH
> rlc

HTH,
	Igor
-- 
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