List the Files in a Directory/Folder (original) (raw)
| list.files {base} | R Documentation |
|---|
Description
These functions produce a character vector of the names of files or directories in the named directory.
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 (see path.expand) is performed. Missing values will be ignored. Elements with a marked encoding will be converted to the native encoding (and if that fails, considered non-existent). |
|---|---|
| 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 (following Unix-style visibility, that is files whose name does not start with a dot). If TRUE, 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. If FALSE, 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 (empty if there were no files). If a path does not exist or is not a directory or is unreadable it is skipped.
The files are sorted in alphabetical order, on the full path if full.names = TRUE.
list.dirs implicitly has all.files = TRUE, and ifrecursive = TRUE, the answer includes path itself (provided it is a readable directory).
dir is an alias for list.files.
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.
Author(s)
Ross Ihaka, Brian Ripley
See Also
[file.info](../../base/help/file.info.html), [file.access](../../base/help/file.access.html)and [files](../../base/help/files.html) for many more file handling functions and[file.choose](../../base/help/file.choose.html)
for interactive selection.
[glob2rx](../../utils/html/glob2rx.html) to convert wildcards (as used by system file commands and shells) to regular expressions.
[Sys.glob](../../base/help/Sys.glob.html) for wildcard expansion on file paths.[basename](../../base/help/basename.html) and dirname, useful for splitting paths into non-directory (aka ‘filename’) and directory parts.
Examples
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)
[Package _base_ version 4.6.0 Index]