Typical RC commands which may be supplied in the /cache/recovery/command file:

recovery.cpp

/*
*   --send_intent=anystring - write the text out to recovery.intent
*   --update_package=path - verify install an OTA package file
*   --wipe_data - erase user data (and cache), then reboot
*   --wipe_cache - wipe cache (but not user data), then reboot
*   --set_encrypted_filesystem=on|off - enables / diasables encrypted fs
*   --just_exit - do nothing; exit
*/