debian terminal no commands found

Im using putty to ssh into the beaglebone as root but it doesnt recognize any command i type. I get this in the terminal when i open putty. IP ADDRESS is

login as: root
Debian GNU/Linux 7 BeagleBone Debian Image 2014-05-14

Last login: Thu May 15 02:24:04 2014 from luis-pc.local
-bash: mesg: command not found
root@beaglebone:~# ls
-bash: ls: command not found
root@beaglebone:~# uname -a
-bash: uname: command not found


I also cant open LXterminal on the bb desktop. Should i re-install debian???

Does it really show the prompt 'login as:'?

Anyway it sounds as if your PATH variable has got messed up somehow.
The bash executable is there because you're running bash.

Try 'echo $PATH' at the bash prompt and tell us what it shows you.

Also try '/bin/ls' and '/bin/uname' to see if the executables are
actually where they should be.