duplication

问题 I want to make a copy of the folders and images on my s3 bucket for my development server. How can I do that? 回答1: I just wanted to write an updated answer here: You can now use Amazon's AWS Management Console (under the S3 tab) to right click on any folder (or file) in Bucket A, click Copy , then navigate to Bucket B and right click and click Paste This makes it extremely easy to copy the contents of your production bucket over to your dev bucket. 回答2: If you are using linux, and just want

问题 I have come across a strange bug in my code and I cannot understand why it happens. I have an array array1. I duplicate array1 by making array2 equal to array1. I then modify array2 using splice to add a number. Array1 should not be touched? But both output the same change. var array1 = [0,1,2,3,4,5]; var array2 = array1; array2.splice(1,0,1) //add console.log(array1); console.log(array2); I am assuming I am confusing array assignment? What is the proper way to duplicate arrays without this

问题 Is there an efficient (fast) algorithm that will perform bit expansion/duplication? For example, expand each bit in an 8bit value by 3 (creating a 24bit value): 1101 0101 => 11111100 01110001 11000111 The brute force method that has been proposed is to create a lookup table. In the future, the expansion value may need to be variable. That is, in the above example we are expanding by 3 but may need to expand by some other value(s). This would require multiple lookup tables that I'd like to

问题 I have a very large number of chess games(around 5 million) stored in several pgn files(portable game notation). If you aren't familiar with PGN, the result will basically be a csv file when parsed, with several fields containing info about the players, location, etc and then one larger text field with the moves separated by some delimeter, possible a space. There will be one row with such data per game. The catch is there may be duplicate games. Ultimately, I would like to store the unique

问题 I am trying to find out what the difference between packet loss and packet duplication problems is. Does anyone know what 'packet duplication' is all about? Is it the same as re-transmitting packets when a loss is detected in TCP? 回答1: No. In TCP delivery of "packets" is reliable(I think the term data should be better in this case, since it's a stream oriented protocol). Packet loss and duplication are problem related to unreliable protocols datagram oriented like UDP . In UDP when you send a

问题 The technical solution can be found here : Entire website hijacked! Part 2: How to configure name-based virtual hosting? The original domain is http://neteditr.com The offending copycat site is http://kitchen.co.jp After reading upon some articles it seems like this kind of website hijacking is done by proxy servers, but how in the world is the link to "neteditr.com" removed from Google's search pages and theirs "kitchen.co.jp" is high up on the list? About a month ago, I could still do a

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: How do I remove code duplication between similar const and non-const member functions? My task is to implement c++ vector analogue. I've coded operator[] for 2 cases. T myvector::operator[](size_t index) const {//case 1, for indexing const vector return this->a[index]; } T & myvector::operator[](size_t index) {//case 2, for indexing non-const vector and assigning values to its elements return this->a[index]; }

问题 I need to call INSERT + SELECT to import user data to different table and I need to filter user_name duplications, So I need something like this: INSERT INTO new_table SELECT email, distinct user_name, password from old_table but distinct works only when using distinct email, user_name, password and all those column need to be unique. Is there any other way to insert select with uniq user_names, (I need only first row - with lower id)? EDIT I forget to mention that I use mysql 回答1: Without

问题 I have an algorithm implemented by a number of classes, all covered by unit test. I would like to refactor it, which will change behavior of two classes. When I change one class and its tests, all unit tests pass, though the algorithm becomes incorrect until refactoring is done. This example illustrates that complete coverage by unit tests is sometimes not enough and I need "integration" tests for the whole algorithm in terms of input-output. Ideally, such tests should cover the behavior of

问题 I have a question about mirrored with TEE option iptables traffic. The main goal is to copy all traffic for service on server A (port 1935) to same service running on server B on same port (port 1935). For example: If I start streaming video to 192.168.0.200:1935 - video should be be on both servers (on 192.168.0.201:1935 and on 192.168.0.200:1935). Google point me to iptables -TEE option. I try to use it on Ubuntu: SERV A -192.168.0.200 SERV B -192.168.0.201 On SERV A (192.168.0.200) I add