Glückwunsch, Bessinger, die Auskunftsqualität des Forums ist mal wieder unter aller Sau. Was du möchtest, ist nicht Trace, sondern Watch.
$ perl -de'while (1) {
> $foo++;
> $bar++;
> }'
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): while (1) {
DB<1> w $foo
DB<2> n
main::(-e:2): $foo++;
DB<2> n
Watchpoint 0: $foo changed:
old value: ''
new value: '1'
main::(-e:3): $bar++;
DB<2> n
main::(-e:2): $foo++;
DB<2> n
Watchpoint 0: $foo changed:
old value: '1'
new value: '2'
main::(-e:3): $bar++;
DB<2> n
main::(-e:2): $foo++;
DB<2> n
Watchpoint 0: $foo changed:
old value: '2'
new value: '3'
main::(-e:3): $bar++;
DB<2> W *
Deleting all watch expressions ...
DB<3> q