$ perl -de0

Loading DB routines from perl5db.pl version 1.28
Editor support available.

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

main::(-e:1):   0
  DB<1> h rerun
rerun           Rerun session to current position.
rerun n         Rerun session to numbered command.
rerun -n        Rerun session to number'th-to-last command.