[OS X TeX] Emacs 22.92, %! and TeXShop
herbs at wideopenwest.com
Fri Jan 26 17:25:33 EST 2007
On Jan 26, 2007, at 4:07 PM, Chris Goedde wrote:
> On Jan 26, 2007, at 3:41 PM, Frank STENGEL wrote:
>> Isn't it
>> That should be the first four bytes of a postscript file?
> No, historically %! was sufficient to identify a postscript file.
> Files that conform to the Postscript document structure convention
> are supposed to start with %!PS-Adobe-3.0 (for example, for PS3),
> but %! is a valid first line for a postscript file. In fact,
> postscript files that are valid but don't conform to all the
> structural conventions are supposed to start with %! (or at least
> not the full %!PS-Adobe-3.0).
> Chris Goedde
The PostScript Language Reference Manual (I've got the old 1985
edition) and it says
``The very first line of every PostScript program (whether it is
conforming or nonconforming) should be a comment that begins with the
and, in the next paragraph, further says
``If the PostScript program is conforming, the remainder of the first
line (after the `%!') should be a version identifier for the
structuring conventions that the file obeys. ... (i.e., the first 11
characters of the program ar `%!PS-Adobe-') ...''
So everyone is correct. Of course all the logic I've seen presented
is still wrong: just because all PostScript files should start with `
%!' (maybe `%!PS...') doesn't mean that all files that start with `
%!' (or even `%!PS...') must be PostScript files.
(herbs at wideopenwest.com)
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