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.pi...@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:j...@mcmaster.ca] > > Sent: Friday, August 19, 2016 3:15 PM > > To: PIKAL Petr <petr.pi...@precheza.cz> > > Cc: r-help@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-boun...@r-project.org] On Behalf Of PIKAL > > > Petr > > > Sent: August 19, 2016 9:00 AM > > > To: r-help@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 > > > > > ________________________________ > Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou > určeny pouze jeho adresátům. > Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě > neprodleně jeho odesílatele. 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