R: Ascertain File Accessibility

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

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