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│            Return the size of a file.              │
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This function reports the size of the file(s) that you
specify. The filename can include a directory path and
may be ambiguous, using the wildcard characters '*' or
'?'. SIZEOF returns the size of the file, in bytes or,
if more than one match is found, the total size of all
the files. 

If a size of zero is returned, the file does not exist
(at least not in the directory specified).  This means
you don't have to open the file to see if it's there.
