$ PERLDB_OPTS="f=3 N LineInfo=xxx" perl -d imlate.pl Default die handler restored. hello! goodbye! hello! goodbye! i'm late! i'm late! i'm late! #### $ cat xxx Package imlate.pl. entering main::hello entering main::goodbye exited main::goodbye entering main::goodbye exited main::goodbye exited main::hello entering main::imlate exited main::imlate