lanx@nc10-ubuntu:~$ perl -de0
 
Loading DB routines from perl5db.pl version 1.3
Editor support available.
 
Enter h or `h h' for help, or `man perldebug' for more help.
 
main::(-e:1):	0
  DB<1> p print "lula"
1lula
  DB<2> x print "horst"
0  1
  DB<3> p print "lula"
1horstlula
  DB<4> p print "lula"
1lula
  DB<5> p print "lula"
1lula
   
 ...
   
  DB<11> x print "horst"
0  1
  DB<12> x print "horst"
0  1
  DB<13> x print "horst"
0  1
  DB<14> p print "lula"
1horsthorsthorstlula