Message-ID: <CAF8bMcaudao7j9PMJPHga7MTgncJHzGsSp_iox67iLhNbzLkvw@mail.gmail.com>
Date: 2016-08-20T00:14:15Z
From: William Dunlap
Subject: file.create issue
In-Reply-To: <6E8D8DFDE5FA5D4ABCB8508389D1BF88C5039C05@SRVEXCHMBX.precheza.cz>
The list of illegal file names on Windows 7 includes "aux", "prn",
"lpt[1-9]", "com[1-9]", and "con",
with or without a 'dot file extension' and in any directory. I think there
used to be be other illegal ones,
like "nul", "pc$mouse" and "clock".
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Fri, 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".
>
> 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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