【正文】
ting system that was initially created as a hobby by a young student, Linus Torvalds, at the University of Helsinki in Finland. Linus had an interest in Minix, a small UNIX system, and decided to develop a system that exceeded the Minix standards. The kernel, at the heart of all Linux systems, is developed and released under the GNU General Public License and its source code is freely available to everyone. It is this kernel that forms the base around which a Linux operating system is developed. 第 11講 使用編輯器 第 17頁 共 20頁 練 習 (續(xù) ) 發(fā)出命令顯示行號 。 第 11講 使用編輯器 第 14頁 共 20頁 模糊搜索 (續(xù) ) ? 正則表達式常用的元字符: . 匹配任何一個字符 ( 回車換行符除外 ) * 匹配零個或零個以上的與前一個字符相同的字符 ^ 匹配下一個字符必須出現在某行的行首 $ 匹配前一個字符必須出現在某行的行末 [ ] 匹配方括號里面的若干個字符的其中一個字符 [ ] 匹配方括號里面的某一范圍字符的一個字符 [^ ] 匹配除了方括號里面的字符之外的其他任何一個字符 \ 把后面的元字符轉義 , 變成普通字符