谁知道这个全局变量是做什么的？
由于特殊字符,我无法通过谷歌找到任何信息.
UPDATE
[root@dev-test v2]$perldoc -v '%^H' Ending switch processing. Args are [%^H] with 0 errors. /usr/bin/perldoc => Pod::Perldoc v3.14 Formatter class Pod::Perldoc::ToMan successfully loaded! Will format with the class Pod::Perldoc::ToMan Searching for %^H Looking for %^H in /usr/bin /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.7/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.6/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.5/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl/5.8.6 /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.7/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.6/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.5/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 . /usr/kerberos/bin /usr/lib64/ccache /usr/local/bin /bin /usr/bin No documentation found for "%^H".
解决方法
从
http://perldoc.perl.org/perlvar.html开始：
•
%^H
The%^Hhash provides the same scoping semantic as$^H. This makes it useful for implementation of lexically scoped pragmas. See 07001.This variable was added in Perl 5.6.