Ruby GEM for File and Directory manipulation

i'm looking for gem(s) which will provide me tools for File and Directory manipulation.

Basicly i开发者_StackOverflow中文版 would like to get possibility to:

• search file in provided directory
• search pattern inside file (different extensions)
• insert into file at precise place content

I know how to do it using Ruby, but it would be nice to get such gem :)

Thanks

Anwser is NO, there isn't one.