命令:grep -r -n 字符串 文件夹名 执行命令:grep -r -n "I was young" test1/ 在文件夹test1中递归查找所有文件中匹配正则表达式 "I was young" 的行,并打印匹配行所在的文件名和行号。 执行命令结果 命令:grep 字符串 文件名* 执行命令:grep "I was young" test* 查找前缀有"I was young"的文件包...
001、 dat <- c("a","k","a","b","q")## 测试字符串向量grep("a", dat)## grep匹配字符串,返回索引值grepl("a", dat)## grepl匹配字符串, 返回向量中匹配的布尔值