perlhist Perl history records
d perldelta Perl changes since previous version
-D perl5100delta Perl changes in version 5.10.0
+D perl5110delta Perl changes in version 5.11.0
+ perl5100delta Perl changes in version 5.10.0
perl595delta Perl changes in version 5.9.5
perl594delta Perl changes in version 5.9.4
perl593delta Perl changes in version 5.9.3