$ perl -d debugLWPtheads.pl Loading DB routines from perl5db.pl version 1.33 Editor support available. Enter h or `h h' for help, or `man perldebug' for more help. main::(debugLWPtheads.pl:35): exit main(); DB<1> c Starting a thread to find all SHAs Devel::CLONE called with args [ Devel ] at debugLWPtheads.pl line 9 thread 1 Devel::CLONE('Devel') called at debugLWPtheads.pl line 23 thread 1 at debugLWPtheads.pl line 9 thread 1 Devel::CLONE('Devel') called at debugLWPtheads.pl line 23 thread 1 This line should be reached without error messages. Debugged program terminated. Use q to quit or R to restart, use o inhibit_exit to avoid stopping after program termination, h q, h R or h o to get additional info. Thread 1 terminated abnormally: Undefined subroutine &Cwd::CLONE called at debugLWPtheads.pl line 23. at debugLWPtheads.pl line 23 thread 1 DB<1> Scalars leaked: 1 Use `q' to quit or `R' to restart. `h q' for details.