Arguments

 

file_spec

   A character string that gives an OpenVMS or UNIX style file
   specification. The usual defaults and logical name translations
   are applied to the file specification.
 

mode

   Interpreted as shown in Interpretation of the mode Argument.

   Table REF-1 Interpretation of the mode Argument

   Mode
   Argument     Access Mode

   F_OK         Tests to see if the file exists
   X_OK         Execute
   W_OK         Write (implies delete access)
   R_OK         Read

   Combinations of access modes are indicated by ORing the values.
   For example, to check to see if a file has RWED access mode,
   invoke access as follows:

   access (file_spec, R_OK | W_OK | X_OK);