[R] Determining which file is newer
Colleagues, I wish to execute a task only if a particular file is newer than a second file. I can access the file modification dates using file.info()$mtime. This yields a time object (? POSIX). sizeisdir modemtime ctime Testfile4421FALSE 755 2009-10-23 08:59:09 2009-10-23 08:59:09 What is the simplest means to compare these two objects? R2.9.1 in OSX, Windows, Linux Dennis Dennis Fisher MD P (The P Less Than Company) Phone: 1-866-PLessThan (1-866-753-7784) Fax: 1-866-PLessThan (1-866-753-7784) www.PLessThan.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Determining which file is newer
Have a look at your company name and your phone number. Nudge nudge, wink wink, say no more... /H On Fri, Oct 23, 2009 at 9:02 AM, Dennis Fisher fis...@plessthan.com wrote: Colleagues, I wish to execute a task only if a particular file is newer than a second file. I can access the file modification dates using file.info()$mtime. This yields a time object (? POSIX). size isdir mode mtime ctime Testfile 4421 FALSE 755 2009-10-23 08:59:09 2009-10-23 08:59:09 What is the simplest means to compare these two objects? R2.9.1 in OSX, Windows, Linux Dennis Dennis Fisher MD P (The P Less Than Company) Phone: 1-866-PLessThan (1-866-753-7784) Fax: 1-866-PLessThan (1-866-753-7784) www.PLessThan.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Determining which file is newer
On Fri, Oct 23, 2009 at 5:02 PM, Dennis Fisher fis...@plessthan.com wrote: Colleagues, I wish to execute a task only if a particular file is newer than a second file. I can access the file modification dates using file.info()$mtime. This yields a time object (? POSIX). size isdir mode mtime ctime Testfile 4421 FALSE 755 2009-10-23 08:59:09 2009-10-23 08:59:09 What is the simplest means to compare these two objects? Split the string representation of the object into date and time parts, then split those parts into day, month , year and hour minute second, taking care of internationalisation and localisation, then recombine all those parts into a number of seconds since Jan 1 1970, taking care of leap seconds and the slowing down of the earth due to the tides of the moon. Or just use the usual operators: file.info(/etc/passwd)$mtime = file.info(/etc/motd)$mtime [1] TRUE Barry __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
