.FILE EXISTS

This subroutine is called to check if a file exists in the filesystem.


Usage:

     PASS        <exists?>                 FIELD           SHARE? Y
     PASS        <pathname>                FIELD           SHARE? N
     GOSUB   --- .FILE EXISTS
     *       check for errors
     IF      --- .FILE EXISTS              NE

Description:

This subroutine is called to check if a file exists in the filesystem. Both parameters are required, the subroutine will CANCEL if they are not received.

<exists?> is the result, indicating if file exists or not (Required). This must be PASSed with Share "Y". Returns Y if the file exists, N if not.

<pathname> is pathname to test (Required).

Notes:

The subroutine tries to open the file for Read access, and if it cannot, it returns a "N". It cannot distinguish between a file that does not exist and a file it cannot open due to file permissions, both cases will return "N".

You can also use this to test if a directory exists by passing a directory name.

Comments:

Read what other users have said about this page or add your own comments.


-- PeteBrower - 2011-08-12

Edit | Attach | Watch | Print version | History: r6 < r5 < r4 < r3 < r2 | Backlinks | Raw View | Raw edit | More topic actions...
Topic revision: r3 - 2013-08-28 - AlKalter
 
  • Edit
  • Attach
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2024 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback