[Q] Flash update.zip with fastboot or adb

I'm trying to flash someting a update.zip package that contains su and busybox programs, and I know what you think, I'm rooting a device.
I've googled and there's the adb shell and fastboot programs that can help me but, how can flash it by commands?
Copy pasting the updater-script commands and the busybox installer too?
Please help me out! D:

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