R command execution from shell
Thank you for this alternative. Both seem to work on my systems. Sebastien
Prof Brian Ripley wrote:
On Tue, 4 Jan 2011, Duncan Murdoch wrote:
On 04/01/2011 3:21 PM, Sebastien Bihorel wrote:
Dear R-users,
Is there a way I can ask R to execute the "write("hello
world",file="hello.txt")" command directly from the UNIX shell, instead
of having to save this command to a .R file and execute this file
with R
CMD BATCH?
Yes. Some versions of R support the -e option on the command line to
execute a particular command. It's not always easy to work out the
escapes so your shell passes all the quotes through... An
alternative is to echo the command into the shell, e.g.
echo 'cat("hello")' | R --slave
(where the outer ' ' are just for bash).
It is marginally preferable to use Rscript in place of 'R --slave'.
I think in all known shells
Rscript -e "write('hello world', file = 'hello.txt')"
will work. (If not, shQuote() will not work for that shell, but this
does work in sh+clones, csh+clones, zsh and Windows' cmd.exe.)