file.info(..., extra_cols = TRUE)
file.mode(...)
file.mtime(...)
file.size(...)path.expand."octmode". The file permissions,
printed in octal, for example 644."POSIXct":
file modification, ‘last status change’ and last access times.uid interpreted as a user name.
grnamecharacter: gid interpreted as a group name.
Unknown user and group names will be NA.
windows
execharacter: what sort of executable is this? Possible
values are "no", "msdos", "win16",
"win32", "win64" and "unknown". Note that a
file (e.g., a script file) can be executable according to the mode
bits but not executable in this sense.If extra_cols is false, only the first six columns are
returned: as these can all be found from a single C system call this
can be faster. (However, properly configured systems will use a
name service cache daemon to speed up the name lookups.)Entries for non-existent or non-readable files will be NA.
unix
The uid, gid, uname and grname columns
may not be supplied on a non-POSIX Unix-alike system, and will not be
on Windows.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.file.mode, file.mtime and file.size are
convenience wrappers returning just one of the columns.
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.
unix
On most systems symbolic links are followed, so information is given
about the file to which the link points rather than about the link.
windows
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.
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
finf # the whole list
## Those that are more than 100 days old :
finf <- file.info(dir(), extra_cols = FALSE)
finf[difftime(Sys.time(), finf[,"mtime"], units = "days") > 100 , 1:4]
file.info("no-such-file-exists")
Run the code above in your browser using DataLab