Hi,
on Windows 7 (tested on NTFS file system) and R-devel:
1. file.info("C:/") gives NAs whilst file.exists("C:/") gives TRUE.
Instead you have to do file.info("C:/.").
2. Any number of dots will do, e.g.
identical(file.info("C:/........."), file.info("C:/.")) == TRUE
DETAILS:
# C:/ => DISCREPANCY file.exists() and file.info()
> file.exists("C:/")
[1] TRUE
> file.info("C:/")
size isdir mode mtime ctime atime exe
C:/ NA NA <NA> <NA> <NA> <NA> <NA>
> x <- list.files("C:/")
> str(x)
chr [1:62] "$Recycle.Bin" "Boot" "bootmgr" "BOOTSECT.BAK" ...
> x <- shell('dir "C:/"', intern=TRUE)
> str(x)
chr [1:57] " Volume in drive C is Windows7_OS" ...
# C:/. => OK
> file.exists("C:/.")
[1] TRUE
> file.info("C:/.")
size isdir mode mtime ctime atime exe
C:/. 0 TRUE 777 1980-01-01 1980-01-01 1980-01-01 no
> x <- list.files("C:/.")
> str(x)
chr [1:62] "$Recycle.Bin" "Boot" "bootmgr" "BOOTSECT.BAK" ...
> x <- shell('dir "C:/."', intern=TRUE)
> str(x)
chr [1:57] " Volume in drive C is Windows7_OS" ...
# C:/.. => OK
> file.exists("C:/..")
[1] TRUE
> file.info("C:/..")
size isdir mode mtime ctime atime exe
C:/.. 0 TRUE 777 1980-01-01 1980-01-01 1980-01-01 no
> x <- list.files("C:/..")
> str(x)
chr [1:62] "$Recycle.Bin" "Boot" "bootmgr" "BOOTSECT.BAK" ...
> x <- shell('dir "C:/.."', intern=TRUE)
> str(x)
chr [1:57] " Volume in drive C is Windows7_OS" ...
# C:/... => SURPRISE IN R
> file.exists("C:/...")
[1] TRUE
> file.info("C:/...")
size isdir mode mtime ctime atime exe
C:/... 0 TRUE 777 1980-01-01 1980-01-01 1980-01-01 no
> x <- list.files("C:/...")
> str(x)
chr [1:62] "$Recycle.Bin" "Boot" "bootmgr" "BOOTSECT.BAK" ...
> x <- shell('dir "C:/..."', intern=TRUE)
File Not Found
Warning message:
running command 'C:\Windows\system32\cmd.exe /c dir "C:/..."' had status 1
> sessionInfo()
R Under development (unstable) (2011-09-13 r57004)
Platform: x86_64-pc-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
/Henrik
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