| Line 16... |
Line 16... |
| 16 |
}
|
16 |
}
|
| 17 |
\arguments{
|
17 |
\arguments{
|
| 18 |
\item{op}{a character string specifying the test to be performed.
|
18 |
\item{op}{a character string specifying the test to be performed.
|
| 19 |
Unary tests (only \code{x} is used) are \code{"-f"} (existence and
|
19 |
Unary tests (only \code{x} is used) are \code{"-f"} (existence and
|
| 20 |
not being a directory), \code{"-d"} (existence and directory) and
|
20 |
not being a directory), \code{"-d"} (existence and directory) and
|
| 21 |
\code{"-x"} (executable as a file or searchable as a directory).
|
21 |
\code{"-x"} (executable as a file or searchable as a directory).
|
| 22 |
Binary tests are \code{"-nt"} (strictly newer than, using the modification
|
22 |
Binary tests are \code{"-nt"} (strictly newer than, using the modification
|
| 23 |
dates) and \code{"-ot"} (strictly older than): in both cases the
|
23 |
dates) and \code{"-ot"} (strictly older than): in both cases the
|
| 24 |
test is false unless both files exist.}
|
24 |
test is false unless both files exist.}
|
| 25 |
\item{x, y}{character vectors giving file paths.}
|
25 |
\item{x, y}{character vectors giving file paths.}
|
| 26 |
}
|
26 |
}
|
| Line 28... |
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| 28 |
\sQuote{Existence} here means being on the file system and accessible
|
28 |
\sQuote{Existence} here means being on the file system and accessible
|
| 29 |
by the \code{stat} system call (or a 64-bit extension) -- on a
|
29 |
by the \code{stat} system call (or a 64-bit extension) -- on a
|
| 30 |
Unix-alike this requires execute permission on all of the directories in
|
30 |
Unix-alike this requires execute permission on all of the directories in
|
| 31 |
the path that leads to the file, but no permissions on the file
|
31 |
the path that leads to the file, but no permissions on the file
|
| 32 |
itself.
|
32 |
itself.
|
| 33 |
|
33 |
|
| 34 |
For the meaning of \code{"-x"} on Windows see \code{\link{file.access}}.
|
34 |
For the meaning of \code{"-x"} on Windows see \code{\link{file.access}}.
|
| 35 |
}
|
35 |
}
|
| 36 |
\seealso{
|
36 |
\seealso{
|
| 37 |
\code{\link{file.exists}} which only tests for existence
|
37 |
\code{\link{file.exists}} which only tests for existence
|
| 38 |
(\code{test -e} on some systems) but not for not being a directory.
|
38 |
(\code{test -e} on some systems) but not for not being a directory.
|
| 39 |
|
39 |
|
| 40 |
\code{\link{file.path}}, \code{\link{file.info}}
|
40 |
\code{\link{file.path}}, \code{\link{file.info}}
|
| 41 |
}
|
41 |
}
|
| 42 |
\examples{
|
42 |
\examples{
|
| 43 |
dir <- file.path(R.home(), "library", "stats")
|
43 |
dir <- file.path(R.home(), "library", "stats")
|
| 44 |
file_test("-d", dir)
|
44 |
file_test("-d", dir)
|
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