Access(Name, Mode)
Access: INTEGER(KIND=1) function.
Name: CHARACTER; scalar; INTENT(IN).
Mode: CHARACTER; scalar; INTENT(IN).
Intrinsic groups: unix.
Description:
Checks file Name for accessibility in the mode specified by Mode and
returns 0 if the file is accessible in that mode, otherwise an error
code if the file is inaccessible or Mode is invalid.
See access(2).
A null character (CHAR(0)) marks the end of
the name in Name—otherwise,
trailing blanks in Name are ignored.
Mode may be a concatenation of any of the following characters: