and run time. Once a C<BEGIN> has run, it is immediately undefined and any
code it used is returned to Perl's memory pool.
-It should be noted that C<BEGIN> and C<UNITCHECK> code blocks B<are>
-executed inside string C<eval()>'s. The C<CHECK> and C<INIT> code
-blocks are B<not> executed inside a string eval, which e.g. can be a
-problem in a mod_perl environment.
-
An C<END> code block is executed as late as possible, that is, after
perl has finished running the program and just before the interpreter
is being exited, even if it is exiting as a result of a die() function.
C<INIT> blocks are run just before the Perl runtime begins execution, in
"first in, first out" (FIFO) order.
+The C<CHECK> and C<INIT> code blocks will not be executed inside a string
+eval(), if that eval() happens after the end of the main compilation
+phase; that can be a problem in mod_perl and other persistent environments
+which use C<eval STRING> to load code at runtime.
+
When you use the B<-n> and B<-p> switches to Perl, C<BEGIN> and
C<END> work just as they do in B<awk>, as a degenerate case.
Both C<BEGIN> and C<CHECK> blocks are run when you use the B<-c>