[bash manual](https://link.segmentfault.com/?enc=HmVJygJ0kB8xBXP6NfRKQA%3D%3D.KEVjctuthpoCnO39KzGeqx5LA168DA1zr123BmX9cHsdg0GZZ0P2%2FyouhelFEGUc) [linux脚本攻略](https://link.segmentfault.com/?enc=UGCFAxiMU6r%2BtmJ8MhtIfw%3D%3D.y1iau14p4A%2F5pkLjQ2wveCwZAh4EWOkgSds0Iy0h7zg2d%2BrUGC9jmaMpox61kgvT)(一位大神二十多岁的时候写的 ) [Unix编程环境](https://link.segmentfault.com/?enc=WR1bCA8o86hm3UyF%2Bh8LJw%3D%3D.EdHDWypDkJSBCWIPYy1WMUhvFL2y22sCEscrggA19L3Xvcg4WE4gnTPRluUidB%2F3)