quotes in Rscript -e through system
On 24.05.2012 12:58, abhagwat wrote:
I figured out how to use quotes and parentheses when using Rscript -e (on a bash shell): Rscript -e write\(1,\"a.txt\"\) --> Question 1: why do the parentheses need to be escaped in the shell? (More a shell than an R question)
Because the shell shopudl not interpret quotes and parantheses but pass all the string to R.
Then I figured out how to use quotes and parentheses when calling Rscript
through system:
system('Rscript -e write\\(1,\\\'a.txt\\\'\\)')
--> Question 2: why exactly is it necessary to use double and triple
escapes? I kinda understand it, but not completely.
double: \ is a special character in R that escapes the second \ triple: actually a double \ for the reason geiven above, and then \' for protecting the ' to be evaluated (i.e. indicating the end of the former ' before the Rscript). Uwe Ligges
Thanks for your insights! Adi -- View this message in context: http://r.789695.n4.nabble.com/quotes-in-Rscript-e-through-system-tp4631186.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at 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.