First we need to set the program to debug. As with gdb, you
can start lldb and specify the file you wish to debug on the command line:
$ lldb /Projects/Sketch/build/Debug/Sketch.app
Current executable set to '/Projects/Sketch/build/Debug/Sketch.app' (x86_64).
or you can specify it after the fact with the "file" command:
$ lldb
(lldb) file /Projects/Sketch/build/Debug/Sketch.app
Current executable set to '/Projects/Sketch/build/Debug/Sketch.app' (x86_64).