Can't find /sys/class

I have Ubuntu 14.04 running, setup Eclipse and can cross compile the HelloWorld program to my Beaglebone (white). The Beaglebone is running Ubuntu 12.04. I then tried moving to the blinking LED program in Derek Malloy’s tutorial for C++. When I type the command /sys$ cd class I get message that says the file or directory does not exist. I tried the command on my Beaglebone and also on my desktop. I assume there is some step in setting up Ubuntu that I missed. Any help will be appreciated. Thanks

I reinstalled Ubuntu 14.04 and now I can find the /sys/class directory. Not sure what caused the problem but at least it is working now.