MARK
//TODO
http://www.360doc.com/content/12/0419/14/496343_204908029.shtml
http://www.cnblogs.com/fhefh/archive/2011/04/22/2024750.html
http://jianlee.ylinux.org/Computer/Shell/parameter_substitution.html
//${var#parttern} 通配符
http://www.chinaunix.net/old_jh/24/399487.html