cd /usr/local/src/

mkdir yuicompressor

cd yuicompressor

git clone git@github.com:yui/yuicompressor.git

ln -s /usr/local/src/yuicompressor/yuicompressor/
build/yuicompressor-2.4.8pre.jar /usr/local/lib/yuicompressor.jar

java -jar /usr/local/lib/yuicompressor.jar
 aaa.css -o aaa.min.css --charset utf-8

java -jar /usr/local/lib/yuicompressor.jar
 aaa.css bbb.css ccc.css -o mix.min.css --charset utf-8