On 08/07/2012 14:35, Uwe Ligges wrote:
On 08.07.2012 14:47, syrvn wrote:
Hello,
when I use list.files with recursive = TRUE and all.files = TRUE, R
returns
a list of strings/paths.
From all those strings I want to keep only the ones starting with a .
I tried using grep to achieve that. However, the problem is that
because of
the recursive list.files parameter,
for some files beginning with a . there is a path attached. I think it is
not as simple as it looks because all files
end with . something. .xlsx or .txt or .r...
files <- list.files("~", recursive = TRUE, all.files = TRUE)
files
/XXX/ZZZ/.R_history
/XXX/ZZZ/AAA/Script.r
/XXX/ZZZ/BBB/test.xlsx
/XXX/ZZZ/CCC/.xyz
files <- files[grep("^.*$", files)]
I want grep to return only the following to lines:
/XXX/ZZZ/.R_history
/XXX/ZZZ/CCC/.xyz
You do not need grep, let list.files do all the stuff for you:
list.files("~", recursive = TRUE, all.files = TRUE, pattern="^\\.")
Some people find the equivalent pattern = "^[.]" clearer to read.
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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