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You can also confirm that the program will suspend at line 5 and you can use info command again. Let's see the local variables with info command, and continue. Stop by #0 BP - Line /mnt/c/ko1/src/rb/ruby-debug/target.rb:3 (line) Let's continue the program by continue command. You can see that two breakpoints are registered. (rdbg) break # show all registered breakpoints #1 BP - Line /mnt/c/ko1/src/rb/ruby-debug/target.rb:5 (line) #0 BP - Line /mnt/c/ko1/src/rb/ruby-debug/target.rb:3 (line)

(rdbg) break 3 # set breakpoint at line 3

Let's set breakpoints on line 3 and line 5 with break command ( b for short). Rdbg command suspends the program at the beginning of the given script ( target.rb in this case) and you can use debug commands. $ rdbg target.rb # run like `ruby target.rb` Using rdbg command (or bundle exec rdbg) to launch the program without any modifications, you can run the program with the debugger. If you don't want to modify the source code, you can set breakpoints with a debug command break ( b for short). Invoke the program from the debugger as a traditional debuggers (rdbg) info locals # And you can see the updated local variables => 8| binding.break # Again the program stops here (rdbg) info locals # You can show local variables (The version constraint is important debug 5| binding.break # Now you can see it stops at this line If you use Bundler, write the following line to your Gemfile. Or specify -Ipath/to/debug/lib in RUBYOPT or each ruby command-line option, especially for debug this gem development. Support suspending and entering to the console debugging with Ctrl-C at most of timing.Support threads (almost done) and ractors (TODO).By loading libraries with -r command line option.Integration with rich debugger frontendsĮxtensible: application can introduce debugging support with several ways:.Remote debugging: Support remote debugging natively. Fast: No performance penalty on non-stepping mode and non-breakpoints.This debug.rb is replacement of traditional lib/debug.rb standard library which is implemented by set_trace_func. This library provides debugging functionality to Ruby (MRI) 2.6 and later.