perlhist Perl history records
d perldelta Perl changes since previous version
-D perl592delta Perl changes in version 5.9.2
+D perl593delta Perl changes in version 5.9.3
+ perl592delta Perl changes in version 5.9.2
perl591delta Perl changes in version 5.9.1
perl590delta Perl changes in version 5.9.0
perl586delta Perl changes in version 5.8.6