在node.js中的大文件中删除最后N个字节

Question

I am looking for a way to delete the last few bytes in a large file in node.js without buffering the entire file into the memory and saving it. Is there any way to do this?

Edit: By "last few bytes" I mean characters. I have tried fs.truncate but it just deletes the entire file's contents.

Truncate not working example:

var fs = require('fs');

fs.truncate('C:\\NODEAPP\\totruncate.txt', 0, function(){
    console.log('File got cleared... Is 0 supposed to delete the last character?');
})

Answer 1

I figured it out. The 0 means how long the file should be afterwards.

var fs = require('fs');

fs.truncate('C:\\NODEAPP\\totruncate.txt', 5, function(){
    console.log('Kept first 5 bytes, deleted the rest.');
})