From: Mark E. Shoulson (email@example.com)
Date: Thu Jan 20 2005 - 08:53:06 CST
Marcin 'Qrczak' Kowalczyk wrote:
>"Oliver Christ" <firstname.lastname@example.org> writes:
>>On the very contrary. It's most helpful to determine a text file's
>>encoding. Without the UTF8 BOM it's hard to tell whether a file is
>>encoded in some ISO or whatever encoding/codepage or is already UTF8.
>The problem with BOM in UTF8 is that it must be specially handled by
>all applications. It effectively turns UTF-8 into a stateful encoding
>where the beginning of a "text stream" must be treated specially.
>World would be simpler if UTF-8 BOM was banned.
>Fortunately I have never met a Unix program which used a UTF-8 BOM,
>so I can mostly ignore the issue, except that text files coming from
>Windows may have that annoying thing at the beginning which must be
That seems to be it; just a quick fix when needed.
From what I can see, the real problem of BOMs is that they break the
model of UTF-8 as a superset of ASCII (well, sorta). That is, if I take
an ASCII-only file, load it into a Unicode-aware text editor, and then
save it back as UTF-8, I would *expect* to have an ASCII-only file,
since UTF-8 subsumes ASCII and I didn't change anything. But no,
there's this little snippet of meta-data that got tacked on to the front
of my actual data that suddenly takes me out of the ASCII realm. OK, I
can see that as annoying, but probably not a show-stopper. The trouble
really is that UNIX doesn't store encodings with its files, so a file
might be expected to be ASCII or Latin-1 or binary or who-knows-what,
and the applications that deal with it somehow have to figure it out or
guess (possibly wrongly), while Microsoft's files are expected to be
UTF-8 through and through (or so I am inferring, also probably wrongly).
I'm not as anti-Microsoft as the next person: I'm actually quite a bit
*more* anti-Microsoft than the next person. And yet at least in the
case of the #! convention, I don't see why UNIX can't bend a little.
Just check for '#!' *or* 'BOM#!' when you open a file for execution.
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