Thanks to Henrik and David for responses. Both were right. A small edit
to my description of the problem (which has now been solved). I said
that the first version of system2 ( system2("sed -i s/oldword/newword/g
d:/junk/x/test.tex")) worked fine but in fact it was not working, it
just wasn't giving me an error.
Both of these work:
system("sed -i 's/oldword\\s/oldword/g' d:/junk/x/test.tex")
system2("sed", args=c("-i", "s/oldword\\s/newword/g",
"d:/junk/x/test.tex"))
Thanks again,
Zev
On 10/11/2013 1:24 PM, Henrik Bengtsson wrote:
system2("sed", args=c("-i", "s/oldword\\s/newword/g", "d:/junk/x/test.tex"))
/Henrik
On Fri, Oct 11, 2013 at 8:58 AM, David Winsemius <dwinsem...@comcast.net> wrote:
On Oct 10, 2013, at 8:16 AM, Zev Ross wrote:
Hi All,
I'm trying to edit a file in place using system2 and sed from within R. I can get my
command to work unless there is a backslash in the command in which case I'm warned about
an "unrecognized escape". So, for example:
system2("sed -i s/oldword/newword/g d:/junk/x/test.tex") # works fine
system2("sed -i s/oldword\s/newword/g d:/junk/x/test.tex") # does not work in R
(the command works on the command line)
I've experimented with double slashes to escape the \s,
Wouldn't you want to double the backslashes instead?
I've tried the "shell" command, I've tried experimenting with shQuote and can't seem to
get around the "unrecognized escape" issue.
By the way, it would be preferable to have a solution that avoided using double
backslashes etc because, unfortunately, in my real-world example, I'm actually
replacing double slashes and would prefer not to have quadruple slashes etc.
I'm using Windows 7, 64 bit.
Zev
--
Zev Ross
ZevRoss Spatial Analysis
120 N Aurora, Suite 3A
Ithaca, NY 14850
607-277-0004 (phone)
z...@zevross.com
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius
Alameda, CA, USA
______________________________________________
R-help@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.
--
Zev Ross
ZevRoss Spatial Analysis
120 N Aurora, Suite 3A
Ithaca, NY 14850
607-277-0004 (phone)
z...@zevross.com
______________________________________________
R-help@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.
