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.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 (Unix/Linux only).

Comments:

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-- PeteBrower - 2011-08-12

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Topic revision: r6 - 2014-07-24 - AlKalter
 
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