[R] file.create issue

[David Winsemius]

> On Aug 19, 2016, at 6:47 AM, PIKAL Petr <petr.pikal at precheza.cz> wrote:
> 
> Thank you , John.
> 
> As I wanted to use com as abbreviated value for comments it gave me hard time, especially when the name was not only com1 but "com1.txt".
> 

Whinges about the behavior of Windows are OT on Rhelp.

-- 
David.

> Best regards
> Petr
> 
> 
>> -----Original Message-----
>> From: Fox, John [mailto:jfox at mcmaster.ca]
>> Sent: Friday, August 19, 2016 3:15 PM
>> To: PIKAL Petr <petr.pikal at precheza.cz>
>> Cc: r-help at r-project.org
>> Subject: RE: file.create issue
>> 
>> Dear Petr,
>> 
>> This is a Windows OS issue, not peculiar to R. There are some reserved
>> names that can't be used for files, including COM1 (the first serial port).
>> Other examples include LPT1 and AUX. Because file names in windows are
>> case-insensitive "com1.txt" also causes problems.
>> 
>> I hope this helps,
>> John
>> 
>> -----------------------------
>> John Fox, Professor
>> McMaster University
>> Hamilton, Ontario
>> Canada L8S 4M4
>> Web: socserv.mcmaster.ca/jfox
>> 
>> 
>> 
>>> -----Original Message-----
>>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of PIKAL
>>> Petr
>>> Sent: August 19, 2016 9:00 AM
>>> To: r-help at r-project.org
>>> Subject: [R] file.create issue
>>> 
>>> Hi
>>> 
>>> Can anybody explain why one character makes such a difference?
>>> 
>>>> file.create("com1.txt")
>>> [1] FALSE
>>> Warning message:
>>> In file.create("com1.txt") :
>>>  cannot create file 'com1.txt', reason 'No such file or directory'
>>>> file.create("con1.txt")
>>> [1] TRUE
>>>> 
>>> 
>>> It took me quite effort to find out that "com1.txt" is not valid for naming a
>> file.
>>> 
>>> BTW I am on Windows, if it matters.
>>> 
>>> Best regards
>>> Petr
>>> 
> 
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David Winsemius
Alameda, CA, USA