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Ask the Wizard Questions

DCL: /SINCE and /BEFORE problems with opened files

The Question is:

A problem using /BEFORE/SINCE filters:

I have a program which continuously writes data to a text file.
Each 8 hours, the file is closed, and a new one is opened.  The
files have the same base name, but the date is coded in the
file name extension.  I want to copy the files to another VAX node
as they are closed, using a batch job.  Using the following


The closed file is properly copied, but the command also tries
to copy the file just opened.  The command bombs out, because
my program has the open file locked.  I though that the
/BEFORE=-1 should filer out files created within the last hour.
The following command:


gives the expected result, reporting only the file created 8 hours
ago, an not the file created a few minutes ago.

What am I doing wrong?

The Answer is:

    Nothing. Just an unfortunate implementation detail.
    Most VMS utilities use a common set of routine to deal
    with file selection qualifiers such as /before and /exclu
    That package use RMS to get dates filled in through an OPEN.
    As you, and others, found out, that open can fail if the
    file is currently opened dis-allowing others.
    Directory, being more intimate with file headers and such,
    will uses a direct ACP QIO to get file attibutes with an
    option to ignore the file access lock.

    	- Teach the procedure to ignore the error:
    		$ON ERROR
    		$IF $STATUS .EQ...
    	- Use directory to build a list of file to copy:
    	- Have the application change filenames after the close.