$ wget http://dl.fedoraproject.org/pub/epel/5/x86_64/colordiff-1.0.6a-2.el5.noarch.rpm
$ rpm -Uvh colordiff-1.0.6a-2.el5.noarch.rpm
$ diff hoge.txt fuga.txt
$ colordiff hoge.txt fuga.txt
banner=no
color_patches=no
plain=off
newtext=green
oldtext=cyan
diffstuff=yellow
cvsstuff=white
alias diff='colordiff'
[helpers]
diff-cmd = colordiff