file.create issue
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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