# perl -de '1;' 

Loading DB routines from perl5db.pl version 1.60
Editor support available.

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

main::(-e:1):   1;
  DB<1> v
Undefined subroutine &DB::cmd_l called at /usr/local/lib/perl5/5.34.0/perl5db.pl line 6034.
 at /usr/local/lib/perl5/5.34.0/perl5db.pl line 6034.
        DB::cmd_v("v", "", 1) called at /usr/local/lib/perl5/5.34.0/perl5db.pl line 4798
        DB::cmd_wrapper("v", "", 1) called at /usr/local/lib/perl5/5.34.0/perl5db.pl line 4311
        DB::Obj::_handle_cmd_wrapper_commands(DB::Obj=HASH(0x558a9ea7b5c0)) called at /usr/local/lib/perl5/5.34.0/perl5db.pl line 3200
        DB::DB called at -e line 1