ACCESS - The GNU Fortran Compiler
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### 8.4 `ACCESS` — Checks file access modes

Description:
  `ACCESS(NAME, MODE)` checks whether the file NAME exists, is readable, writable or executable. Except for the executable check, `ACCESS` can be replaced by Fortran 95's `INQUIRE`.
Standard:
  GNU extension
Class:
  Inquiry function
Syntax:
  `RESULT = ACCESS(NAME, MODE)`
Arguments:

  NAME | Scalar `CHARACTER` of default kind with the file name. Tailing blank are ignored unless the character `achar(0)` is present, then all characters up to and excluding `achar(0)` are used as file name.
  MODE | Scalar `CHARACTER` of default kind with the file access mode, may be any concatenation of `"r"` (readable), `"w"` (writable) and `"x"` (executable), or `" "` to check for existence.

Return value:
  Returns a scalar `INTEGER`, which is `0` if the file is accessible in the given mode; otherwise or if an invalid argument has been given for `MODE` the value `1` is returned.
Example:

                program access_test
                  implicit none
                  character(len=*), parameter :: file  = 'test.dat'
                  character(len=*), parameter :: file2 = 'test.dat  '//achar(0)
                  if(access(file,' ') == 0) print *, trim(file),' is exists'
                  if(access(file,'r') == 0) print *, trim(file),' is readable'
                  if(access(file,'w') == 0) print *, trim(file),' is writable'
                  if(access(file,'x') == 0) print *, trim(file),' is executable'
                  if(access(file2,'rwx') == 0) &
                    print *, trim(file2),' is readable, writable and executable'
                end program access_test

Specific names:
See also: