Date: Wed, 27 Jan 2010 14:25:41 -0500 From: "Aryeh M. Friedman" <aryeh.friedman@gmail.com> To: Glen Barber <glen.j.barber@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: OT: finding every file not in a list Message-ID: <4B609335.8060808@gmail.com> In-Reply-To: <20100127191737.GA70795@orion.hsd1.pa.comcast.net> References: <4B6090FC.4070002@gmail.com> <20100127191737.GA70795@orion.hsd1.pa.comcast.net>
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Glen Barber wrote:
> Hi,
>
> Aryeh M. Friedman wrote:
>
>> I have a list of files that should be in a dir tree and want to remove
>> any files from the tree not in list (i.e. if it is on the list keep it
>> else rm it)... any quick way to do this?
>>
>
> Perhaps something like this will help:
>
> find /dir -type f | \
> grep -v `cat excludelist` | \
> xargs rm
>
> Regards,
>
>
Note quite since it will see every file after the first as a file to be
grepped instead of filtered out... I was playing with the idea of doing
a tcsh foreach loop on each file and then using it cut down the output
of find... the problem there is it is O(n^2) where is a "good" solution
is O(n) [I need to do this {don't ask the reasons} everytime I build a
program I am developing]
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