| file.info {base} | R Documentation |
Utility function to extract information about files on the user's file systems.
file.info(...)
... |
character vectors containing file paths. Tilde-expansion
is done: see |
What constitutes a ‘file’ is OS-dependent but includes
directories. (However, directory names must not include a trailing
backslash or slash on Windows.) See also the section in the help for
\;link{file.exists} on case-insensitive file systems.
The file ‘mode’ follows POSIX conventions, giving three octal digits summarizing the permissions for the file owner, the owner's group and for anyone respectively. Each digit is the logical or of read (4), write (2) and execute/search (1) permissions.
File modes are probably only useful on NTFS file systems, and it seems
all three digits refer to the file's owner.
The execute/search bits are set for directories, and for files based
on their extensions (e.g., ‘.exe’, ‘.com’, ‘.cmd’
and ‘.bat’ files). file.access will give a more
reliable view of read/write access availability to the R process.
UTF-8-encoded file names not valid in the current locale can be used.
Junction points and symbolic links are followed, so information is given about the file/directory to which the link points rather than about the link.
A data frame with row names the file names and columns
size |
double: File size in bytes. |
isdir |
logical: Is the file a directory? |
mode |
integer of class |
mtime, ctime, atime |
integer of class |
exe |
character: what sort of executable is this? Possible
values are |
Entries for non-existent or non-readable files will be NA.
What is meant by the three file times depends on the OS and file
system. On Windows native file systems ctime is the file
creation time (something which is not recorded on most Unix-alike file
systems). What is meant by ‘file access’ and hence the
‘last access time’ is system-dependent.
The times are reported to an accuracy of seconds, and perhaps more on some systems. However, many file systems only record times in seconds, and some (e.g. modification time on FAT systems) are recorded in increments of 2 or more seconds.
Sys.readlink to find out about symbolic links,
files, file.access,
list.files,
and DateTimeClasses for the date formats.
Sys.chmod to change permissions.
ncol(finf <- file.info(dir()))# at least six
## Not run: finf # the whole list
## Those that are more than 100 days old :
finf[difftime(Sys.time(), finf[,"mtime"], units="days") > 100 , 1:4]
file.info("no-such-file-exists")