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.
