[Rd] should dir(all=TRUE) return "." and ".."?

From: William Dunlap <wdunlap_at_tibco.com>
Date: Fri, 23 Sep 2011 15:49:43 +0000


dir(all=TRUE) returns the file names "." and ".." while dir(recursive=TRUE, all=TRUE, include.dirs=TRUE) does not. I always filter out the "." and ".." entries and was wondering if anyone would mind if dir(all=TRUE) just omitted them? It might make recursive file operations like cleaning out a directory safer, as
  unlink(recursive=TRUE, dir(all=TRUE, "dirToClean")) might start attacking dirToClean/.., then dirToClean/../..,
etc., until your disk is empty.

> dir.create(tdir <- tempfile("tdir"))
> file.create(file.path(tdir, c(".dotFile", "noDotFile")))
  [1] TRUE TRUE
> dir.create(file.path(tdir, ".dotDir"))
> file.create(file.path(tdir, ".dotDir", c("noDotFileInDotDir", ".dotFileInDotDir")))
  [1] TRUE TRUE
> dir(tdir, all=TRUE) # omit "." and ".." here?
  [1] "." ".." ".dotDir" ".dotFile"   [5] "noDotFile"
> dir(tdir, all=TRUE, recursive=TRUE, include.dirs=TRUE)

  [1] ".dotDir"                   ".dotDir/.dotFileInDotDir" 
  [3] ".dotDir/noDotFileInDotDir" ".dotFile"                 
  [5] "noDotFile"                

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com



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