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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David Winsemius
Alameda, CA, USA
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