I run Raspbian. Everything worked fine until now, when it seems I can't use any command on my Raspberry Pi. I tried to reboot. And now it doesn't connect to wifi.
@raspberrypi: sudo su
-bash: /usr/bin/sudo: cannot execute binary file
@raspberrypi ~ $ ls /usr/ Segmentation fault
After connecting to a display, I get the following log. (ilustrated in a picture)