[Q] Problem with Mount Command

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May 2, 2011
I have a rooted T-Mobile Nexus S. In order to get the Google video app working, I needed to change the name of the "su" app to "mu". I did that by going into root explorer, telling it to make /system readable & writeable, and then renaming "su" to "mu". That worked, but now I want to go back. But I can't use the root explorer approach, since it is looking for an app named "su" to allow me to set /system to readable & writeable.

So I opened terminal emulator on my phone and and tried typing this:
mount -o rw,remount /system
mv /system/bin/mu /system/bin/su

But I get the following message back after the second line:
Usage: mount[-r] [-w] [-o options] [-t type] device directory

I also tried rearranging it to the following command, but it didn't work:
mount -o remount,rw /system

I event tried the following, which still gave me the same error message:
mount /system

Any suggestions?