...
source .env_mach_specific.sh
./case.submit --no-batch
If you're using a visual debugger, this may be enough to work. If you're using a command-line debugger such as "gdb," we need to find a way to allow stdin to interact. You can avoid redirecting the output to file by removing the contents of "run_misc_suffix" in env_mach_specific.xml. However, I don't know how to enable interactive stdin input.