Terminal wont open because i change usermod -s /usr/bin/

[Distlingur]

Hi hi i was messing arround withouth thanking and changed my #usermod -s /usr/bin/ to this so everytime i start Terminal now i get this error message

There was an error creating the child process for this terminal
failed to execute child process "/usr/bin/"
any suggestions what i can do to fix it ?

p.s. i have no idea why i did that haha

[Cheesemill]

Boot into recovery mode and drop to a root shell, then remount your root filesystem in rw mode with...

mount -o rw,remount /

You can then change your shell back again by doing...

usermod -s /bin/bash username

replacing username with your actual username.
Reboot and all should be OK again.