This question already has an answer here:

I'm trying to remount system on a rooted Samsung GT-S6102 running Android 2.3.6:

# mount -o rw,remount,rw /system

Usage: mount [-r] [-w] [-o options] [-t type] device directory

This is exactly like in this other answer, so I'm not sure why I'm getting this usage error.

marked as duplicate by Firelord, Matthew Read Oct 9 '15 at 17:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


So apparently the problem was that I needed to specify the target as per the answer to this other question:

mount -o remount,rw /system /system

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