file

.NET clr function exports
fileSha1	Generate SHA1 checksum of a file
getRelativePath	Gets the relative pathname relative to a directory.
file.size	Extract File Information Utility function to extract information about files on the user's file systems.
file.path	Construct Path to File Construct the path to a file from components in a platform-independent way.
file.info	Extract File Information Utility function to extract information about files on the user's file systems.
file.copy	`file.copy` works in a similar way to `file.append` but with the arguments in the natural order for copying. Copying to existing destination files is skipped unless overwrite = TRUE. The to argument can specify a single existing directory. If copy.mode = TRUE file read/write/execute permissions are copied where possible, restricted by ‘umask’. (On Windows this applies only to files. ) Other security attributes such as ACLs are not copied. On a POSIX filesystem the targets of symbolic links will be copied rather than the links themselves, and hard links are copied separately. Using copy.date = TRUE may or may not copy the timestamp exactly (for example, fractional seconds may be omitted), but is more likely to do so as from R 3.4.0.
file.ext	Get file extension name
dir.copy	copy file contents in one dir to another dir
dir.open	Open an interface to a specific local filesystem location
normalizePath	Express File Paths in Canonical Form Convert file paths to canonical form for the platform, to display them in a user-understandable form and so that relative and absolute paths can be compared.
R.home	Return the R Home Directory Return the R home directory, or the full path to a component of the R installation. The R home directory is the top-level directory of the R installation being run. The R home directory Is often referred To As R_HOME, And Is the value Of an environment variable Of that name In an R session. It can be found outside an R session by R RHOME.
dirname	`dirname` returns the part of the `path` up to but excluding the last path separator, or "." if there is no path separator.
list.files	List the Files in a Directory/Folder
list.dirs	List the Files in a Directory/Folder
file_ext	File Utilities
basename	removes all of the path up to and including the last path separator (if any).
normalizeFileName	removes all of the invalid character for the windows file name
file.exists	`file.exists` returns a logical vector indicating whether the files named by its argument exist. (Here ‘exists’ is in the sense of the system's stat call: a file will be reported as existing only if you have the permissions needed by stat. Existence can also be checked by file.access, which might use different permissions and so obtain a different result. Note that the existence of a file does not imply that it is readable: for that use file.access.) What constitutes a ‘file’ is system-dependent, but should include directories. (However, directory names must not include a trailing backslash or slash on Windows.) Note that if the file is a symbolic link on a Unix-alike, the result indicates if the link points to an actual file, not just if the link exists. Lastly, note the different function exists which checks for existence of R objects.
file.allocate
dir.create	dir.create creates the last element of the path, unless recursive = TRUE. Trailing path separators are discarded. On Windows drives are allowed in the path specification and unless the path is rooted, it will be interpreted relative to the current directory on that drive. mode is ignored on Windows. One of the idiosyncrasies of Windows Is that directory creation may report success but create a directory with a different name, for example dir.create("G.S.") creates '"G.S"’. This is undocumented, and what are the precise circumstances is unknown (and might depend on the version of Windows). Also avoid directory names with a trailing space.
dir.exists	dir.exists returns a logical vector of TRUE or FALSE values (without names).
readLines	Read Text Lines from a Connection Read some or all text lines from a connection.
readText	Reads all characters from the current position to the end of the given stream.
writeLines	Write Lines to a Connection Write text lines to a connection.
getwd	getwd returns an absolute filepath representing the current working directory of the R process;
setwd	setwd(dir) is used to set the working directory to dir.
save.list	Save a R# object list in json file format
read.list	read list from a given json file
file	Functions to create, open and close connections, i.e., "generalized files", such as possibly compressed files, URLs, pipes, etc.
readBin	ransfer Binary Data To and From Connections Read binary data from or write binary data to a connection or raw vector.
writeBin
close	close connections, i.e., “generalized files”, such as possibly compressed files, URLs, pipes, etc.
open.zip	open a zip file
open.gzip	decompression of a gzip file and get the deflate file data stream.
buffer	create a new buffer object
tempfile	Create Names for Temporary Files `tempfile` returns a vector of character strings which can be used as names for temporary files.
tempdir	Create Names For Temporary Files
file.rename	File renames
file.remove	Delete files or directories `file.remove` attempts to remove the files named in its argument. On most Unix platforms ‘file’ includes empty directories, symbolic links, fifos and sockets. On Windows, ‘file’ means a regular file and not, say, an empty directory.
unlink	Delete files or directories
erase	delete all contents in target directory
is.sysdir
dataUri	read file as data URI string
bytes	create a in-memory byte stream object

file

File Manipulation

Generate SHA1 checksum of a file

Extract File Information

File Utilities

Write Lines to a Connection

ransfer Binary Data To and From Connections

Create Names for Temporary Files

Create Names For Temporary Files

Delete files or directories