In Git you can add a submodule to a repository. This is basically a sub-repository embedded in your main repository. This can be very useful. A couple of usecases of submodules:
- Separate big codebases into multiple repositories.
| ## Install NGINX | |
| ## when installing on Amazon Linux AMI, use: | |
| $ sudo yum install nginx -y | |
| ## when installing on Amazon Linux 2 AMI, use | |
| $ sudo amazon-linux-extras install nginx1.12 -y | |
| ## Install PHP and PHP-FPM | |
| # for PHP version 7.1 use php71 and php71-fpm instead | |
| $ sudo yum install php -y | |
| $ sudo yum install php-fpm -y |
| language: groovy | |
| jdk: oraclejdk8 | |
| sudo: false # To use new Travis docker-based infrastructure | |
| env: | |
| global: | |
| # $AWS_ACCESS_KEY_ID | |
| - secure: "..." | |
| # $AWS_SECRET_ACCESS_KEY | |
| - secure: "..." |
| Below are the Big O performance of common functions of different Java Collections. | |
| List | Add | Remove | Get | Contains | Next | Data Structure | |
| ---------------------|------|--------|------|----------|------|--------------- | |
| ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array | |
| LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List | |
| CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |
| // This script will boot app.js with the number of workers | |
| // specified in WORKER_COUNT. | |
| // | |
| // The master will respond to SIGHUP, which will trigger | |
| // restarting all the workers and reloading the app. | |
| var cluster = require('cluster'); | |
| var workerCount = process.env.WORKER_COUNT || 2; | |
| // Defines what each worker needs to run |
| <select name="nationality"> | |
| <option value="">-- select one --</option> | |
| <option value="afghan">Afghan</option> | |
| <option value="albanian">Albanian</option> | |
| <option value="algerian">Algerian</option> | |
| <option value="american">American</option> | |
| <option value="andorran">Andorran</option> | |
| <option value="angolan">Angolan</option> | |
| <option value="antiguans">Antiguans</option> | |
| <option value="argentinean">Argentinean</option> |
When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:
const Article = require('../../../../app/models/article');Those suck for maintenance and they're ugly.
| # taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/ | |
| # generate server.xml with the following command: | |
| # openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes | |
| # run as follows: | |
| # python simple-https-server.py | |
| # then in your browser, visit: | |
| # https://localhost:4443 | |
| import BaseHTTPServer, SimpleHTTPServer | |
| import ssl |
| $ cd ~ | |
| $ sudo curl -sS https://getcomposer.org/installer | sudo php | |
| $ sudo mv composer.phar /usr/local/bin/composer | |
| $ sudo ln -s /usr/local/bin/composer /usr/bin/composer | |
| then you can run | |
| $ sudo composer install |
| #!/bin/bash | |
| # Sample App Init script for running sample app daemon | |
| # | |
| # chkconfig: - 98 02 | |
| # | |
| # description: Sample Application Upstart, using Forever | |
| APPHOME=/opt/sample-app | |
| APPSCRIPT=app.js |