[R] grep in filename

[Charles C. Berry]

On Thu, 4 Oct 2007, Alberto Monteiro wrote:

> Is there any version of grep that gets information from the filename?
>
> For example:
> x <- "myfile.txt"
> y <- grep.file("my text", x)
> should return in y the lines with my text.
>
> I know that
> x <- "myfile.txt"
> y <- grep("my text", readLines(x))
> will probably work, but maybe there's a more direct (and
> less memory hungry) option.

Let your system utilities handle the burden.

For *NIXes, this approach:

 	http://finzi.psych.upenn.edu/R/Rhelp02a/archive/101103.html

and Windows XP

 	http://finzi.psych.upenn.edu/R/Rhelp02a/archive/101220.html

Chuck

>
> Alberto Monteiro
>
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>

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901