| file_test {utils} | R Documentation |
Utility for testing files.
file_test(op, x, y)
op |
a character string specifying the test to be performed.
Unary tests (only x is used) are "-f" (existence and
not being a directory) and "-d" (existence and directory);
binary tests are "-nt" (newer than, using the modification
dates) and "-ot". |
x,y |
character vectors giving file paths. |
file_test performs shell-style file tests.
Note that file.exists only tests for existence
(test -e on some systems) but not for not being a directory.
dir <- file.path(R.home(), "library", "stats")
file_test("-d", dir)
file_test("-nt", file.path(dir, "R"), file.path(dir, "demo"))