shQuote and cat

[Vadim Organovich]

Dear R-users,

It is my understanding that cat(shQuote(a.string)) should print the origintal a.string. Is this right?
I am not sure cat() correctly prints strings which are generated by triple-shQuote():

> shQuote(shQuote("a"))
[1] "\"\\\"a\\\"\""
> cat(shQuote(shQuote(shQuote("a"))), '\n')
"\"\\"a\\"\<file://\\"a\\"\>""
As you can see the latter string has fewer quoting '\' than the former.
cat() of double shQuote works as expected:

> shQuote("a")
[1] "\"a\""
> cat(shQuote(shQuote("a")), '\n')
"\"a\""
> version
               _
platform       i386-pc-mingw32
arch           i386
os             mingw32
system         i386, mingw32
status
major          2
minor          6.1
year           2007
month          11
day            26
svn rev        43537
language       R
version.string R version 2.6.1 (2007-11-26)
Am I missing something?

Thanks,
Vadim

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[Duncan Murdoch-2]

On 7/23/2008 12:20 PM, Vadim Organovich wrote:
> Dear R-users,
>
> It is my understanding that cat(shQuote(a.string)) should print the origintal a.string. Is this right?

No, cat(a.string) should print the original a.string.  shQuote(a.string)
adds quotes so that a.string can be used in the shell.

> I am not sure cat() correctly prints strings which are generated by triple-shQuote():
>
>> shQuote(shQuote("a"))
> [1] "\"\\\"a\\\"\""
>> cat(shQuote(shQuote(shQuote("a"))), '\n')
> "\"\\"a\\"\<file://\\"a\\"\>""

That's a very strange result.  I tried the obsolete version of R that
you're using, and I didn't see it. I get this:

 > cat(shQuote(shQuote(shQuote("a"))), '\n')
"\"\\"a\\"\""

Duncan Murdoch

> As you can see the latter string has fewer quoting '\' than the former.
> cat() of double shQuote works as expected:
>
>> shQuote("a")
> [1] "\"a\""
>> cat(shQuote(shQuote("a")), '\n')
> "\"a\""
>> version
>                _
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          6.1
> year           2007
> month          11
> day            26
> svn rev        43537
> language       R
> version.string R version 2.6.1 (2007-11-26)
> Am I missing something?
>
> Thanks,
> Vadim
>
> ________________________________
> Note: This email is for the confidential use of the named addressee(s) only and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you are hereby notified that any review, dissemination or copying of this email is strictly prohibited, and to please notify the sender immediately and destroy this email and any attachments. Email transmission cannot be guaranteed to be secure or error-free. Jump Trading, therefore, does not make any guarantees as to the completeness or accuracy of this email or any attachments. This email is for informational purposes only and does not constitute a recommendation, offer, request or solicitation of any kind to buy, sell, subscribe, redeem or perform any type of transaction of a financial product.
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@... 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.

______________________________________________
R-help@... 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.