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ru.perl
- RU.PERL ----------------------------------------------------------------------
From : Andrey Sapozhnikov 2:5020/400 28 Mar 2002 17:05:34
To : Victor Wagner
Subject : Re: Символ возврата каретки
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Victor Wagner wrote:
> Линухи этого не понимают только в первой строке. Которая
> #!/usr/bin/perl
> И пытаются выполнить файл с именем "perl\r"
>
> В самом скрипте perl это прекрасно понимает.
Очень зависит от версии и ключей при компиляции самого Perl.
До 5.004 это была фатальная ошибка. Подробней:
perldoc perl5004delta
...
Illegal character %s (carriage return)
(F) A carriage return character was found in the
input. This is an error, and not a warning, because
carriage return characters can break multi-line
strings, including here documents (e.g., "print
<<EOF;").
...
perldoc perl5005delta
...
More generous treatment of carriage returns
Perl used to complain if it encountered literal carriage
returns in scripts. Now they are mostly treated like
whitespace within program text. Inside string literals
and here documents, literal carriage returns are ignored
if they occur paired with linefeeds, or get interpreted as
whitespace if they stand alone. This behavior means that
literal carriage returns in files should be avoided. You
can get the older, more compatible (but less generous)
behavior by defining the preprocessor symbol
"PERL_STRICT_CR" when building perl. Of course, all this
has nothing whatever to do with how escapes like "\r" are
handled within strings.
Note that this doesn't somehow magically allow you to keep
all text files in DOS format. The generous treatment only
applies to files that perl itself parses. If your C comЅ
piler doesn't allow carriage returns in files, you may
still be unable to build modules that need a C compiler.
...
perldoc perldelta (для 5.6.1)
...
Scripts are read in binary mode by default to allow
ByteLoader (and the filter mechanism in general) to work
properly. For compatibility, the DATA filehandle will be
set to text mode if a carriage return is detected at the
end of the line containing the __END__ or __DATA__ token;
if not, the DATA filehandle will be left open in binary
mode. Earlier versions always opened the DATA filehandle
in text mode.
...
perldoc perldiag (для 5.6.1)
...
Illegal character %s (carriage return)
(F) Perl normally treats carriage returns in the proЅ
gram text as it would any other whitespace, which
means you should never see this error when Perl was
built using standard options. For some reason, your
version of Perl appears to have been built without
this support. Talk to your Perl administrator.
...
Андрей
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Re: Символ возврата каретки 