list.files
List the Files in a Directory/Folder
These functions produce a character vector of the names of files or directories in the named directory.
- Keywords
- file
Usage
list.files(path = ".", pattern = NULL, all.files = FALSE,
full.names = FALSE, recursive = FALSE,
ignore.case = FALSE, include.dirs = FALSE, no.. = FALSE) dir(path = ".", pattern = NULL, all.files = FALSE,
full.names = FALSE, recursive = FALSE,
ignore.case = FALSE, include.dirs = FALSE, no.. = FALSE)
list.dirs(path = ".", full.names = TRUE, recursive = TRUE)
Arguments
- path
a character vector of full path names; the default corresponds to the working directory,
getwd(). Tilde expansion (seepath.expand) is performed. Missing values will be ignored.- pattern
an optional regular expression. Only file names which match the regular expression will be returned.
- all.files
a logical value. If
FALSE, only the names of visible files are returned. IfTRUE, all file names will be returned.- full.names
a logical value. If
TRUE, the directory path is prepended to the file names to give a relative file path. IfFALSE, the file names (rather than paths) are returned.- recursive
logical. Should the listing recurse into directories?
- ignore.case
logical. Should pattern-matching be case-insensitive?
- include.dirs
logical. Should subdirectory names be included in recursive listings? (They always are in non-recursive ones).
- no..
logical. Should both
"."and".."be excluded also from non-recursive listings?
Value
A character vector containing the names of the files in the
specified directories, or "" if there were no files. If a
path does not exist or is not a directory or is unreadable it
is skipped, with a warning.
The files are sorted in alphabetical order, on the full path
if full.names = TRUE.
list.dirs implicitly has all.files = TRUE, and if
recursive = TRUE, the answer includes path itself
(provided it is a readable directory).
Note
File naming conventions are platform dependent. The pattern matching works with the case of file names as returned by the OS.
On a POSIX filesystem recursive listings will follow symbolic links to directories.
path must specify paths which can be represented in the current
codepage, and files/directories below path whose names cannot
be represented in that codepage will most likely not be found.
See Also
file.info, file.access
and files for many more file handling functions and
file.choose
and choose.files
for interactive selection.
glob2rx to convert wildcards (as used by system file
commands and shells) to regular expressions.
Sys.glob for wildcard expansion on file paths.
Examples
library(base)
# NOT RUN {
list.files(R.home())
## Only files starting with a-l or r
## Note that a-l is locale-dependent, but using case-insensitive
## matching makes it unambiguous in English locales
dir("../..", pattern = "^[a-lr]", full.names = TRUE, ignore.case = TRUE)
list.dirs(R.home("doc"))
list.dirs(R.home("doc"), full.names = FALSE)
# }