"Run Command" file editing (i.e. " *.rc " files): Echoing to the terminal like Linux?

Question

I am editing the Android phone file "init.tuna.rc" so that it prints to me some basic debugging checkpoint messages so I can analyze how far the phone gets in the boot process.

Does anyone know if you can simply insert the shell scripting syntax for console printing into a "run command" file (.rc)?

(I need to know this if someone can help me before I rebuild all of my code for the Android tree to test this debugging code, given the process can a while)

Will the following work? I want to insert in the following code snippet into the "init.tuna.rc" file:

# Boot debugging Checkpoint #2
echo "Check #2:  Successfully wrote the file system data, including the wifi directories!"

If this does not work, what can I do to get the "rc" file to print messages to the actual terminal as it executes?

Answer 1

Android Boot Language is documented in a readme.txt file in the source tree under <android>/system/core/init . No echo is mentioned, but you can try. Also remember that you should write to a file because stderr and stdout are redirected to /dev/null .

See https://github.com/aosp-mirror/platform_system_core/blob/master/init/README.md