搜索目錄以獲取文件名在R

Question

在C：\ test中有一個名爲haha的文件，haha包含字符look for me，在linux中，我可以搜索以獲取文件名。

find/ -name "look for me" 

我可以使用某種R命令在xp os中搜索文件嗎？
如果我不知道包含字符look for me的文件名是haha，那我該怎麼辦？

Answer 1

或plyr：

require(plyr) # uses plyr 
textFiles<-list.files(pattern=".txt") # only looks at .txt file, you can change or omit 
#alply reads each file and returns 
# a list of filenames which pass the grep test 
# and indicate the first line identified 
mylist<-alply(textFiles, 
      1, 
      function(f){fline<-grep("LOOK FOR ME",readLines(f)) 
         ifelse(fline>0,paste(f,fline,sep=" - line:"),NULL) 
      }) 
Filter(is.character,mylist) # gives you a list of all files containing the term 

Answer 2

這段代碼會在裏面找到一個帶有短語'haha'的文件名。然後檢查字符串「尋找我」是否發生在它的任何地方。那是你要的嗎？

whichfile <- grep(
    x = list.files(), 
    pattern = "haha", 
    value = TRUE 
) 

sum(
    grepl(
    x = readLines(whichfile), 
    pattern = 'look for me') 
)