Lost busybox commands after QT installation

After installing the QT (http://www.cloud-rocket.com/2013/07/building-qt-for-beaglebone/), I can’t access the regular shell (busybox commands) anymore.

root@beaglebone:# ls
ls: command not found

I only have few commands available:

root@beaglebone:~# help
GNU bash, version 4.2.10(1)-release (arm-angstrom-linux-gnueabi)
These shell commands are defined internally. Type help' to see this list. Type help name’ to find out more about the function name'. Use info bash’ to find out more about the shell in general.
Use man -k' or info’ to find out more about commands not in this list.

Any idea what happened?

Thanks

Probably killed the PATH variable, by copying exactly what they said here:

PATH="...:/opt/qt/lib"

Regards,