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From: vsarkela@csc.fi
Newsgroups: comp.lang.postscript
Subject: Re: PostScript headers
Message-ID: <1991Jun12.231051.1@csc.fi>
Date: 12 Jun 91 23:10:51 GMT
References: <1991Jun11.092741.27041@cheops.qld.tne.oz.au> <1991Jun11.133128.20685@nntp-server.caltech.edu>
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In article <1991Jun11.133128.20685@nntp-server.caltech.edu>, 
carl@iago.caltech.edu (Lydick, Carl) writes:
> In article <1991Jun11.092741.27041@cheops.qld.tne.oz.au>, 
colemanm@cheops.qld.tne.oz.au (Mark Coleman) writes...
>>I'm sorry if this is a FAQ but I don't normally frequent this group.
>> 
>>I'd like to know what is the absolute definitive way to recognise a
>>Postscript file.
> 
> The only "absolute definitive" way to recognize one is to send it to a printer
> or other display device that's running Adobe PostScript.  If the printer
> accepts it, it was PostScript;  otherwise, it wasn't.
> --------------------------------------------------------------------------------
> Carl J Lydick	HEPnet/NSI: SOL1::CARL	Internet: CARL@SOL1.GPS.CALTECH.EDU

My experience is, that if you copy a windows 3 postscript file to printer
attached directly to the PC, it works fine.
On the other hand, if you transfer that file to a u*ix machine and try lpr
to print it, nothing happens. I solved this problem with a filter, which
inserts carriage return and line feed after the control-d.

Control-d is required to reset the printer after previous job (it clears
the header, which normally comes with each ps file) and %! must be the 
two first characters after cr lf. I haven't checked out, if ultrix drivers
(filters) or decserver insert something after control-d...

-Vesa Sarkela    Finnish Pulp & Paper Research Institute