How do I do undo chmod /usr/bin

Question

For some reason I was messing around and did chmod -x /usr/bin/* (no idea what I was thinking)

Is there a way to fix this, because at the moment nothing is executable

Answer 1

chmod +x /usr/bin/*

In case your chmod binary is in /usr/bin you could try to sftp a copy of the file in from another host.

Or boot from live CD, mount the right filesystem, and chmod +x the file.