On Windows, ‘env’ is only supported for commands such as ‘R’ and ‘make’ which accept environment variables on their command line.
So I suppose that would be tricky. The basic issue is that on Unix-alikes, system2 constructs a command like FOO=bar cmd args and passes that to sh via system(). On windoes, system() does not call sh, so system2() does (effectively) cmd FOO=bar args and hopes that cmd knows what to do with the env setting. -pd > On 19 Mar 2019, at 11:09 , Gábor Csárdi <csardi.ga...@gmail.com> wrote: > > On Tue, Mar 19, 2019 at 9:59 AM peter dalgaard <pda...@gmail.com> wrote: > [...] >> What you need is something like (NB: single quotes!) >>> system2("sh", env = c("VAR='Hello World'"), args = c("-c 'echo $VAR'")) >> Hello World > > Just out of curiosity, do you think it is possible to make this > portable, assuming sh is available? On Windows it gives > >> system2("sh", env = c("VAR='Hello World'"), args = c("-c 'echo $VAR'")) > /rtools34/bin/sh: VAR=Hello World: No such file or directory > Warning message: > running command '"sh" VAR='Hello World' -c 'echo $VAR'' had status 127 > > G. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel