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Debugging in Perl is very extensive, this demo is very basic!  Check the reference for further instruction. You can manipulate PERLDB_OPTS variable, to force some debugging - then just pass through a -d option to your perl script. Also system debugging is at the reference tab.
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export PERLDB_OPTS="NonStop frame=1 AutoTrace" perl -d -pi'.bak' -e 's/unix/UNIX/g' *htm* Output: Package -e.
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
1: s/unix/UNIX/g
0: BEGIN { require 'perl5db.pl' };LINE: while () {
entering Config::DESTROY
entering IO::Handle::DESTROY
entering IO::Handle::DESTROY
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