$ ./dbg
Default die handler restored.

Loading DB routines from perl5db.pl version 1.07
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

             NonStop = '1'
DBI::CODE(0x82f8a04)(/usr/local/lib/perl/5.6.1/DBI.pm:419):
419:        return unless defined &DBI::trace_msg; # return unless bootstrap'd ok
  DB<1> x $u
0  undef
  DB<2> c
Debugged program terminated.  Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.  
  DB<2> x $u
0  MY::User=HASH(0x8505bec)
   'id' => 1
   'name' => 'Brad Bowman'
   'passwd' => 'password'
   'username' => 'bsb'
  DB<3>