tempfile {base} | R Documentation |
tempfile
returns a vector of character strings which can be used as
names for temporary files.
tempfile(pattern = "file", tmpdir = tempdir(), fileext = "") tempdir()
pattern |
a non-empty character vector giving the initial part of the name. |
tmpdir |
a non-empty character vector giving the directory name |
fileext |
a non-empty character vector giving the file extension |
The length of the result is the maximum of the lengths of the three arguments; values of shorter arguments are recycled.
The names are very likely to be unique among calls to tempfile
in an R session and across simultaneous R sessions. The filenames are
guaranteed not to be currently in use.
The file name is made by concatenating the path given by tmpdir
,
the pattern
string, a random string in
hex, and a suffix of fileext
.
By default, tmpdir
will be the directory given by
tempdir()
. This will be a subdirectory of the temporary
directory found by the following rule. The environment variables
TMPDIR, TMP and TEMP are checked in turn and the
first found which points to a writable directory is used:
if none succeeds ‘/tmp’ is used.
The optional argument fileext
can be used to supply a file
extension, for example fileext=".png"
.
For tempfile
a character vector giving the names of possible
(temporary) files. Note that no files are generated by tempfile
.
For tempdir
, the path of the per-session temporary directory.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
unlink
for deleting files.
tempfile(c("ab", "a b c")) # give file name with spaces in! tempfile("plot", fileext=c(".ps", ".pdf")) tempdir() # works on all platforms with a platform-dependent result