Tutorial by Examples: d

One could easily center a child element using table display property. HTML <div class="wrapper"> <div class="parent"> <div class="child"></div> </div> </div> CSS .wrapper { display: table; vertica...

Cache-Control: private, max-age=60 private specifies that the response can be cached only for user who requested the resource, and can't be reused when other users request the same resource. This is appropriate for responses that depend on cookies.

Cache-Control: no-cache The client will behave as if the response was not cached. This is appropriate for resources that can unpredictably change at any time, and which users must always see in the latest version. Responses with no-cache will be slower (high latency) due to need to contact the s...

Cache-control: no-store Instructs clients no to cache the response in any way, and to forget it at soon as possible. This directive was originally designed for sensitive data (today HTTPS should be used instead), but can be used to avoid polluting caches with responses that can't be reused. It...

Expires — specifies date when the resource becomes stale. It relies on servers and clients having accurate clocks and supporting time zones correctly. Cache-control: max-age takes precedence over Expires, and is generally more reliable. post-check and pre-check directives are non-standard I...

DateTime date = new DateTime(2016, 07, 06, 18, 30, 14); // Format: year, month, day hours, minutes, seconds Console.Write(String.Format("{0:dd}",date)); //Format by Culture info String.Format(new System.Globalization.CultureInfo("mn-MN"),"{0:dddd}",date); 6....

To send a remote command via SSH (the SSH server needs to be running on the remote host), you can simply write the command after user@machine. ssh [email protected] echo 'Hello World' Hello World It returns back the output to the sender, executed on the remote host.

Many commands and programs in the remote side are screen-based (e.g. mc) or they need to ask password (e.g. sudo), to be able to run these kind of programs you can use option -t. ssh -t [email protected] sudo ls / [sudo] password for alice: bin root dev etc home lib mnt opt proc root run usr ...

Fabric is a Python (2.5-2.7) library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks. It lets you execute arbitrary Python functions via the command line. Install fabric via pip install fabric Create fabfile.py in your root directory...

The following simple procedure displays the text "Hello World" in a client that supports dbms_output. CREATE OR REPLACE PROCEDURE helloworld AS BEGIN dbms_output.put_line('Hello World!'); END; / You need to execute this at the SQL prompt to create the procedure in the database,...

set serveroutput on DECLARE message constant varchar2(32767):= 'Hello, World!'; BEGIN dbms_output.put_line(message); END; / Command set serveroutput on is required in SQL*Plus and SQL Developer clients to enable the output of dbms_output. Without the command nothing is displayed. T...

Django handles a request by routing the incoming URL path to a view function. The view function is responsible for returning a response back to the client making the request. Different URLs are usually handled by different view functions. To route the request to a specific view function, Django look...

A simple hello world grammar can be found here: // define a grammar called Hello grammar Hello; r : 'hello' ID; ID : [a-z]+ ; WS : [ \t\r\n]+ -> skip ; To build this .g4 sample you can run the following command from your operating systems terminal/command-line: Java -jar antlr-4.5.3-...

foldMap maps each element of the Foldable structure to a Monoid, and then combines them into a single value. foldMap and foldr can be defined in terms of one another, which means that instances of Foldable need only give a definition for one of them. class Foldable t where foldMap :: Monoid m...

As parameters (8, 16, 32 bits) 8, 16, 32 bits integers are always passed, on the stack, as full width 32 bits values1. No extension, signed or zeroed, is needed. The callee will just use the lower part of the full width values. //C prototype of the callee void __attribute__((cdecl)) foo(char ...

As parameters (float, double) Floats are 32 bits in size, they are passed naturally on the stack. Doubles are 64 bits in size, they are passed, on the stack, respecting the Little Endian convention1, pushing first the upper 32 bits and than the lower ones. //C prototype of callee double foo(dou...

This is a very common workflow when using Ansible for provisioning an AWS EC2 instance. This post assumes a basic understand of Ansible and most importantly, assumes you've properly configured it to connect to AWS. As Ansible official documentation insists, we are going to use four roles: 1- ami_f...

Overflow also happens during the operation. In the following example, x is an int, 1 is an int by default. Therefore addition is an int addition. And the result will be an int. And it will overflow. int x = int.MaxValue; //MaxValue is 2147483647 long y = x + 1; //...

To install an APK file, use the following command: adb install path/to/apk/file.apk or if the app is existing and we want to reinstall adb install -r path/to/apk/file.apk To uninstall an application, we have to specify its package adb uninstall application.package.name Use the following...

import cv2 image_path= #put your image path here #use imread() function to read image data to variable img. img = cv2.imread(image_path) #display image data in a new window with title 'I am an image display window' cv2.imshow('I am an image display window',img) #wait until user hi...