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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