R: List the Files in a Directory/Folder

list.files {base} | R Documentation

## List the Files in a Directory/Folder

### 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.
`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. 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, 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.

### Author(s)

Ross Ihaka, Brian Ripley

### See Also

`file.info`, `file.access` and `files` for many more file handling functions and `file.choose` 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

    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 3.1.2 Index]