| file.access {base} | R Documentation |
Ascertain File Accessibility
Description
Utility function to access information about files on the user's file systems.
Usage
file.access(names, mode = 0)
Arguments
names |
character vector containing file names. |
mode |
integer specifying access mode required. |
Details
The mode value can be the exclusive or of the following values
- 0
test for existence.
- 1
test for execute permission.
- 2
test for write permission.
- 4
test for read permission.
Permission will be computed for real user ID and real group ID (rather than the effective IDs).
Value
An integer vector with values 0 for success and -1 for failure.
Note
This is intended as a replacement for the S-PLUS function
access, a wrapper for the C function of the same name, which
explains the return value encoding. Note that
the return value is false for success.
Author(s)
B. D. Ripley
See Also
file.info
Examples
fa <- file.access(dir("."))
table(fa) # count successes & failures