add reference to readme

README.md

@@ -99,4 +99,5 @@ this is the preferred installation method for development as it doesn't require
 * currently, the mounting script disables selinux security controls entirely, which is quite unsafe - please don't have any kind of untrusted apps installed on your device while using this. selinux remains disabled until the next boot, or you can run the command `setenforce 1` to re-enable it earlier. don't forget that the software on the pixel is severely out of date and there are a lot of serious known vulnerabilities. try to keep device radios off (especially bluetooth and NFC) to reduce the attack surface.
 * this scripts in this repo should not make any changes to a pixel that persist past a reboot (besides the scripts themselves existing wherever you saved them)
 * my recommendation for regular usage is to find your drive's filesystem UUID using `./show_devices.sh` and store it. you can then use this UUID in a script to always re-mount that same drive without having to figure out what the block device path is at e.g. something like `./mount_ext4.sh $(./find_device.sh ./my_drive_id.txt)`
+* list of shell utilities available per android version: https://android.googlesource.com/platform/system/core/+/refs/heads/main/shell_and_utilities/#android-10-api-level-29_quince-tart
 * excellent reference: https://android.stackexchange.com/questions/214288/how-to-stop-apps-writing-to-android-folder-on-the-sd-card/257401