R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Current directory
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> path <- "."
> 
> # Test for existence
> print(fileAccess(path, mode=0))
[1] 0
> # Test for execute permission
> print(fileAccess(path, mode=1))
[1] 0
> # Test for write permission
> print(fileAccess(path, mode=2))
[1] 0
> # Test for read permission
> print(fileAccess(path, mode=4))
[1] 0
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # A temporary file
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> pathname <- tempfile()
> cat(file=pathname, "Hello world!")
> 
> # Test for existence
> print(fileAccess(pathname, mode=0))
[1] 0
> # Test for execute permission
> print(fileAccess(pathname, mode=1))
[1] -1
> # Test for write permission
> print(fileAccess(pathname, mode=2))
[1] 0
> # Test for read permission
> print(fileAccess(pathname, mode=4))
[1] 0
> 
> file.remove(pathname)
[1] TRUE
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # The 'base' package directory
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> path <- system.file(package="base")
> 
> # Test for existence
> print(fileAccess(path, mode=0))
[1] 0
> # Test for execute permission
> print(fileAccess(path, mode=1))
[1] 0
> # Test for write permission
> print(fileAccess(path, mode=2))
[1] 0
> # Test for read permission
> print(fileAccess(path, mode=4))
[1] 0
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # The 'base' package DESCRIPTION file
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> pathname <- system.file("DESCRIPTION", package="base")
> 
> # Test for existence
> print(fileAccess(pathname, mode=0))
[1] 0
> # Test for execute permission
> print(fileAccess(pathname, mode=1))
[1] -1
> # Test for write permission
> print(fileAccess(pathname, mode=2))
[1] 0
> # Test for read permission
> print(fileAccess(pathname, mode=4))
[1] 0
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Assert that RNG state does not change (mode = 2)
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> ## Make sure .Random.seed exists
> dummy <- sample(1:10)
> 
> rng0 <- get(".Random.seed", envir = .GlobalEnv, inherits = FALSE)
> res <- fileAccess(tempdir(), mode=2)
> 
> rng1 <- get(".Random.seed", envir = .GlobalEnv, inherits = FALSE)
> stopifnot(identical(rng1, rng0))
> 
> 
> proc.time()
   user  system elapsed 
   0.75    4.95    5.93