to this sample program ensures that the output is completely UTF-8,
and removes the program's warning.
-If your locale environment variables (C<LANGUAGE>, C<LC_ALL>,
-C<LC_CTYPE>, C<LANG>) contain the strings 'UTF-8' or 'UTF8',
-regardless of case, then the default encoding of your STDIN, STDOUT,
-and STDERR and of B<any subsequent file open>, is UTF-8. Note that
-this means that Perl expects other software to work, too: if Perl has
-been led to believe that STDIN should be UTF-8, but then STDIN coming
-in from another command is not UTF-8, Perl will complain about the
+If your locale environment variables (C<LC_ALL>, C<LC_CTYPE>, C<LANG>)
+contain the strings 'UTF-8' or 'UTF8' (matched case-insensitively)
+B<and> you enable using UTF-8 either by using the C<-C> command line
+switch or by setting the PERL_UTF8_LOCALE environment variable to
+a true value, then the default encoding of your STDIN, STDOUT, and
+STDERR, and of B<any subsequent file open>, is UTF-8. Note that this
+means that Perl expects other software to work, too: if Perl has been
+led to believe that STDIN should be UTF-8, but then STDIN coming in
+from another command is not UTF-8, Perl will complain about the
malformed UTF-8.
All features that combine Unicode and I/O also require using the new
open(my $nihongo, '<:encoding(iso-2022-jp)', 'text.jis');
open(my $unicode, '>:utf8', 'text.utf8');
- select $unicode;
- while (<$nihongo>) { print }
+ while (<$nihongo>) { print $unicode $_ }
The naming of encodings, both by the C<open()> and by the C<open>
pragma, is similar to the C<encoding> pragma in that it allows for