=over

=item exit EXPR

Evaluates EXPR and exits immediately with that value.  (Actually, it
calls any defined C<END> routines first, but the C<END> routines may not
abort the exit.  Likewise any object destructors that need to be called
are called before exit.)  Example:

    $ans = <STDIN>;
    exit 0 if $ans =~ /^[Xx]/;

See also C<die()>.  If EXPR is omitted, exits with C<0> status.  The only
universally portable values for EXPR are C<0> for success and C<1> for error;
all other values are subject to unpredictable interpretation depending
on the environment in which the Perl program is running.

You shouldn't use C<exit()> to abort a subroutine if there's any chance that
someone might want to trap whatever error happened.  Use C<die()> instead,
which can be trapped by an C<eval()>.

All C<END{}> blocks are run at exit time.  See L<perlsub> for details.

=back