求解　安装CPAN 进去提示是cpan[1]>，而不是cpan>

是在Fedora 13安装CPAN
第一次进去就多个1?

$ perl -e 'print join "\n",@INC'
/usr/local/lib/perl5
/usr/local/share/perl5
/usr/local/share/perl5
/usr/lib/perl5
/usr/share/perl5
/usr/share/perl5
/usr/lib/perl5
/usr/share/perl5
/usr/local/lib/perl5/site_perl/5.10.0/i386-linux-thread-multi
/usr/local/lib/perl5/site_perl/5.10.0
/usr/lib/perl5/vendor_perl/5.10.0/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl
/usr/lib/perl5/site_perl

o conf commandnumber_in_prompt