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Filters: 6 vs 7 Arguments

Hey List...

CUPS filters and backends take either six or seven arguments, with the optional one being the filename of the file to print. If no file is provided, print data is read from standard in.

Now, it seems that printing from native Mac OS X GUI applications will always cause the print data to be sent on standard in. The only situation where a filename is actually specified as an argument is when you print using lpr on the command line. Is this universally true? If we don't care about command line printing, is print data guaranteed to arrive on the input stream? Are there any scenarios where this will not hold true (managed printing, specific applications, certain input formats, whatever)?

Thanks,
Tobias Peciva
Pharos Systems
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