"The program 'tex' is currently not installed" error after texlive installation on ubuntu 12.04

I tried to install texlive 2014 on Ubuntu 12.04 using downloaded .iso image file.There are some instructions in the following link:Easy way to install TeX Live (and TeX Studio) in Ubuntu 12.04After installation completed successfully I tried to check if everything is OK using the following command:"tex --version"but I got the error:"The program 'tex' is currently not installed. You can install it by typing:sudo apt-get install texlive-binaries"how can I fix this problem to use latest version of texlive on my computer?