摘要： 正则匹配：grep -E "[a-z]+"只输出匹配到的文本：echo this is a line. | grep -o -E "[a-z]+\."统计匹配到的行数:grep -c匹配之外的行:grep -v多级目录中递归搜索:grep "text" . -R -n忽略大小写:grep -i匹配多个样式:grep -e "this" -e "line"grep中包括货排除文件：grep "main()" . -r --include *.{c,cpp}grep " 阅读全文