Okay, firstly you have to download Unix Bench via http://code.google.com/p/byte-unixbench/
You can use the wget command to do this
Next, after you download the unixbench.tar.gz file, you need to extract the files from the archive.
I use: tar -xvf unixbench.tar.gz
Make sure to install the libXext packages
I use: yum install libXext*
Go into the unixbench folder via the command line interface and type
Good luck! ;)