R help - Jun 2007 - test if files in current folder

runner wrote:
> 
> I want to test if the files are already in my current folder before I
> download or copy from somewhere else. What's in my mind is to check if
a
> file is open-able in current folder. Is there a way to do this, like in
> Perl: 
> if (open()) { do sth}?
> 
> To put it another way, how to extract all file names in a folder to an
> array or list? 
> 
?files
?dir

BTW, Perl has nice -X functions, which allow file testing without explicit
opening:
 http://perldoc.perl.org/functions/-X.html
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On Thu, 14 Jun 2007, Vladimir Eremeev wrote:
>
>
>
> runner wrote:
>>
>> I want to test if the files are already in my current folder before I
>> download or copy from somewhere else. What's in my mind is to check
if a
>> file is open-able in current folder. Is there a way to do this, like in
>> Perl:
>> if (open()) { do sth}?
>>
>> To put it another way, how to extract all file names in a folder to an
>> array or list?
>>
>
> ?files
> ?dir
>
> BTW, Perl has nice -X functions, which allow file testing without explicit
> opening:
> http://perldoc.perl.org/functions/-X.html
which are based on those in 'test' and most Unix shells, as is R's 
file.test() in package 'utils'.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595