perldoc Look up Perl documentation in Pod format
perlhist Perl history records
-D perl5131delta Perl changes in version 5.13.1
+D perl5132delta Perl changes in version 5.13.2
+ perl5131delta Perl changes in version 5.13.1
perl5130delta Perl changes in version 5.13.0
perl5120delta Perl changes in version 5.12.0
d perldelta Perl changes since previous version