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Note 1: The following CQ curl commands assumes a admin:admin username and password.
Note 2: For Windows/Powershell users: use two "" when doing a -F cURL command.
        Example: -F"":operation=delete""
Note 3: Quotes around name of package (or name of zip file, or jar) should be included.

Uninstall a bundle (use http://localhost:4505/system/console/bundles to access the Apache Felix web console)
        curl -u admin:admin -daction=uninstall http://localhost:4505/system/console/bundles/"name of bundle"

Install a bundle
        curl -u admin:admin -F action=install -F bundlestartlevel=20 -F 

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" Take <tab> for word complete only
" The 'complete' option controls where the keywords are searched (include files, tag files, buffers, and more).
" The 'completeopt' option controls how the completion occurs (for example, whether a menu is shown).

if exists('did_completes_me_loaded') || v:version < 700
  finish
endif
let did_completes_me_loaded = 1

function! s:completes_me(shift_tab)

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/**
 * Custom submit directive that will only submit when all the validation has passed
 * for all the fields. This extends on the ng-submit directive provided by AngularJS.
 * 
 * This directive will also remove the 'pristine' flag from all the fields when
 * hitting submit, allowing the form to display no errors until the submit button
 * is clicked/enter is pressed.
 * 
 * The variable 'app' is the instance of a module.
 * E.g. var app = angular.module('my-app', []);

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OpenID Connect Session Management Demo

Spec

• Supported :
• http://openid.bitbucket.org/openid-connect-session-1_0.html
• Not Supported yet :
• discovery of OP iframe URL and logout URL

URLs

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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Github
A big project work. If you wanna build website, develop mobile or web application or do your assignment with your teammates of course use github.

Gist
more like a memo. for example you can write the implementation of a small feature and share it to your blog or write down what you think about the project and share it with your teammates. Just like what the above answers said, gist is used for more like code snippet thing. So normally if you work on a project you use github.

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#!/bin/bash

sudo yum update -y

sudo yum install -y netstat git rubygems gcc kernel-devel make perl
sudo yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel maven

sudo gem install sass

cd /tmp

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#!/usr/bin/env python

from __future__ import print_function

import ansible.executor.task_queue_manager
import ansible.inventory
import ansible.parsing.dataloader
import ansible.playbook.play
import ansible.plugins.callback
import ansible.vars

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@ControllerAdvice
public class CustomResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

    @Override
    protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
        List<FieldError> fieldErrors = ex.getBindingResult().getFieldErrors();
        List<ObjectError> globalErrors = ex.getBindingResult().getGlobalErrors();
        List<String> errors = new ArrayList<>(fieldErrors.size() + globalErrors.size());
        String error;
        for (FieldError fieldError : fieldErrors) {

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There is no doubt about the need for automated tests.
They

assure refactoring steps
help to detect weaknesses in the implementation
document the implemented logic
enable the implementation of modules, even if some basic modules are still missing (mocking)
Basically tests consist of 3 steps: Arrange, Act and Assert. That means establishing the test environment (Arrange), executing the logic (Act) and verifying the expectation (Assert).
Consider a bank account with the possibility to deposit money as a simple example. The implementation in advance: