The R Project SVN R

Rev

Rev 68948 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 68948 Rev 80283
Line 14... Line 14...
14 
\usage{
 14 
\usage{
15 
file_test(op, x, y)
 15 
file_test(op, x, y)
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
- 
 
 20 
    \code{"-f"} (existence and not being a directory),
20 
    not being a directory), \code{"-d"} (existence and directory) and
 21 
    \code{"-d"} (existence and directory),
- 
 
 22 
    \code{"-L"} or \code{"-h"} (existence and symbolic link),
21 
    \code{"-x"} (executable as a file or searchable as a directory).
 23 
    \code{"-x"} (executable as a file or searchable as a directory),
- 
 
 24 
    \code{"-w"} (writable) and
- 
 
 25 
    \code{"-r"} (readable).
- 
 
 26 
    Binary tests are
22 
    Binary tests are \code{"-nt"} (strictly newer than, using the modification
 27 
    \code{"-nt"} (strictly newer than, using the modification dates) and
23 
    dates) and \code{"-ot"} (strictly older than): in both cases the
 28 
    \code{"-ot"} (strictly older than):
24 
    test is false unless both files exist.}
 29 
    in both cases the test is false unless both files exist.}
25 
  \item{x, y}{character vectors giving file paths.}
 30 
  \item{x, y}{character vectors giving file paths.}
26 
}
 31 
}
27 
\details{
 32 
\details{
28 
  \sQuote{Existence} here means being on the file system and accessible
 33 
  \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
 34 
  by the \code{stat} system call (or a 64-bit extension) -- on a