On Mon, 2005-09-26 at 17:12 +0100, Prof Brian D Ripley wrote: > On Mon, 26 Sep 2005, Marc Schwartz (via MN) wrote: > > > On Fri, 2005-09-23 at 15:37 -0500, Marc Schwartz (via MN) wrote:
[snip] > > > However, if there is any whitespace in the two arguments, such as: > > > > > > R --slave --vanilla --args "c(5, 5)" "c(.5, .5)" < RScript.R > > > > > > even though surrounded by double quotes (or single quotes or > > > backquotes), the two arguments are parsed as four. > > > > > > Is this behavior expected? I was under the impression, from other C > > > based programs and bash shell scripts for example, that the use of the > > > double quotes would wrap such text and thus be parsed as a single > > > argument. > > Sort of. Unfortunately both the R front-end script and the R executable > get to play here, so once the front-end has parsed the args the quoting > gets lost. You might hope that double quoting would help, but it does not. Prof. Ripley, Thanks kindly for your reply. I suspected that there might be something going on in the startup script and/or the executable, but did not consider that the quoting gets stripped before being passed on to the binary. That makes sense of course. Given that 2.2.0 is imminent, I know timing on this is bad, but is there any logic in considering something along the lines of the following for a future enhancement to the startup script relative to the processing of arguments after '--args'? This generic script takes the arguments from the command line, parses them and adds double quotes back to the arguments as an array, before passing them to the binary executable command line: #!/bin/sh declare -i index declare -a QuotedArgs index=1 for Args in "$@" do echo "Arg $index = $Args" # Arrays are 0 index based QuotedArgs[index-1]=\"$Args\" index=index+1 done echo "R Exec Command: /usr/local/lib/bin/exec/R [EMAIL PROTECTED]" Thus, from the command line, you get the following: $ ./QuoteArgs one two three Arg 1 = one Arg 2 = two Arg 3 = three R Exec Command: /usr/local/lib/bin/exec/R "one" "two" "three" $ ./QuoteArgs "one two" three Arg 1 = one two Arg 2 = three R Exec Command: /usr/local/lib/bin/exec/R "one two" "three" $ ./QuoteArgs "one two three" Arg 1 = one two three R Exec Command: /usr/local/lib/bin/exec/R "one two three" Let me know your thoughts, especially any gotchas on this approach. Best regards, Marc ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
