how to delete or replace a word In file directly

Question

In a large file, how to replace the certain word?

Is there is a way to delete a particular line or word in file?

EDIT:

My file is quite large. I cannot load entire file in to buffer and replace the buffer to file

http://stackoverflow.com/questions/21180412/search-and-replace-string-in-txt-file-in-c — relaxxx, Apr 10 '14 at 13:22
Ordinary files cannot do this unless you rewrite the entire file. Databases use complex file structures and code to accomplish delete or replace. — ScottMcP-MVP, Apr 10 '14 at 13:29

score 1 · Answer 1 · answered Apr 10 '14 at 13:17

1

read each line from the file into a string, then apply std::string's replace (http://www.cplusplus.com/reference/string/string/replace/)

answered Apr 10 '14 at 13:17

Dr. Debasish Jana

I will make changes to string using this... How can i remove the word in file. – VINOTH ENERGETIC Apr 10 '14 at 13:18
1

@VinothKumar You need to read, change, and then write your changes. There's no way to remove parts of files. – molbdnilo Apr 10 '14 at 13:28
Sorry @Debasish Jana I am just new to this... I thought that write in file just insert it in to file instead of replace... Now i am clear – VINOTH ENERGETIC Apr 10 '14 at 13:29
@molbdnilo Then how to deal with large files? Is there is any alternative – VINOTH ENERGETIC Apr 10 '14 at 13:39
@VinothKumar One piece (a line or a predetermined size) at a time. You don't need to store the whole file in RAM at the same time. – molbdnilo Apr 10 '14 at 13:50

1 Answers1