http://cache.baiducontent.com/c?m=9d78d513d99312ee02fa950e1a11a3711824c13e7b9781426b93d3169c3e1d070571e2c83a3f554196d27c1001fe0f01fdf041236a5c3deadad58848deba912832882331771d875612a443e99418&p=8b2a975e9e934eaf5beacd2757429f&newp=882a9546d1981dfc57efdf381107a5231610db2151d0d51e2488&user=baidu&fm=sc&query=bash_source&qid=f53e64a500039039&p1=4

http://stackoverflow.com/questions/4774054/reliable-way-for-a-bash-script-to-get-the-full-path-to-itself

http://www.xuebuyuan.com/1628030.html

http://blog.csdn.net/wonderisland/article/details/22892759