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
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