[Rd] Unix-like touch to update modification timestamp of file?

Gabor Grothendieck ggrothendieck at gmail.com
Wed Feb 27 21:23:51 CET 2008

On Wed, Feb 27, 2008 at 1:27 PM, Henrik Bengtsson <hb at stat.berkeley.edu> wrote:
> On Wed, Feb 27, 2008 at 8:24 AM, Gabor Grothendieck
> <ggrothendieck at gmail.com> wrote:
> > If you only need Windows then this will do it even without RTools:
> >
> >  shell("copy /b /v myfile +,,>nul")
> Interesting.  Show I figured out that '+' is for "append", but how to
> interpret the two commas?

Commas generally have various undocumented effects in Windows batch
and sometimes Microsoft mentions one:

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