Linux学习记录九-正则表达式

grep -c打印总行数 -n显示行号 -v取反 -A*下面几行 -B*上面几行 C* 除了符合条件外上下各几行 -r遍历目录 -h 去掉文件名

.表示任意字符  *表示任意零个或多个*前面的字符 .*在前面基础上包括空行

–color 可以将过滤出的内容红色显示

grep过滤特殊字符需要脱义,而egrep不需要

有多个顾虑条件可以使用 | 来连接

()可将小括号内的内容视为一个整体

 

sed

d

 

 

 

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