Checking for existence of a remote file in gradsdods

[Masters.Steve]

Is there any way withing gradsdods, to check for the existance of a file
without doing an sdfopen?  I have constructed a script that creates a
series of GFS ensemble plots from the NCEP NOMADS DODS sites.  The
different ensembles are in different files and the DODS references are
posted over a span of many hours (and many hours after the regular ftp
files are available from NCEP).  If I submit an sdfopen command against
a file that does not yet exist, gradsdods does a hard abend.  I am using
version 1.8SL10 on both Solaris and Windows.
 
Steve Masters
ENSCO, Inc.
Melbourne, FL

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