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You can also use tee command to store the output of a command in a file and redirect the same output to another command. The following command will write current crontab entries to a file crontab-backup.txt and pass the crontab entries to sed command, which will do the substituion. After the substi...

By default tee command overwrites the file. You can instruct tee to append to the file using the –a option as shown below. $ ls | tee –a file

Here we will create a rest APi which will take file object as a multipart parameter from front end and upload it to S3 bucket using java rest API. Requirement :- secrete key and Access key for s3 bucket where you wanna upload your file. code:- DocumentController.java @RestController @Requ...

PostmarkMailSender.java public class PostmarkMailSender implements MailSender{ private static Logger logger = Logger.getLogger("com.postmark"); private String serverToken; private static Gson gson; static { GsonBuilder gsonBuilder = new GsonBuilder(); ...

class User(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(80)) email = db.Column(db.String(120), unique=True) posts = db.relationship('Post', backref='user') class Post(db.Model): id = db.Column(db.Integer,...

The curl source packages can be downloaded from the following page: https://curl.haxx.se/download.html However, the best way to install it is to use your package repository. For Linux distros, you can use apt-get, yum or rpm depending on the distribution you are using, so the exact command will b...

A typical example of the implementation of a Looper thread given by the official documentation uses Looper.prepare() and Looper.loop() and associates a Handler with the loop between these calls. class LooperThread extends Thread { public Handler mHandler; public void run() { Lo...

A HandlerThread can be used to start a thread with a Looper. This looper then can be used to create a Handler for communications with it. HandlerThread thread = new HandlerThread("thread-name"); thread.start(); Handler handler = new Handler(thread.getLooper());

Detailed instructions on getting graphviz set up or installed.

In this example, we will plot a sine curve and a hyperbolic sine curve in the same plot with a common x-axis having different y-axis. This is accomplished by the use of twinx() command. # Plotting tutorials in Python # Adding Multiple plots by twin x axis # Good for plots having different y axis ...

In this example, a plot with curves having common y-axis but different x-axis is demonstrated using twiny() method. Also, some additional features such as the title, legend, labels, grids, axis ticks and colours are added to the plot. # Plotting tutorials in Python # Adding Multiple plots by twin ...

const { expect } = require('chai') describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', async function() { const result = await answerToTheUltimateQuestion() expect(result).to.be.equal(42) }) }) })

Promises handle errors differently to synchronous or callback-driven code. const p = new Promise(function (resolve, reject) { reject(new Error('Oops')); }); // anything that is `reject`ed inside a promise will be available through catch // while a promise is rejected, `.then` will not be ...

Numeric literals of more than a few digits are hard to read. Pronounce 7237498123. Compare 237498123 with 237499123 for equality. Decide whether 237499123 or 20249472 is larger. C++14 define Simple Quotation Mark ' as a digit separator, in numbers and user-defined literals. This can make it ...

Fibonacci Numbers are a prime subject for dynamic programming as the traditional recursive approach makes a lot of repeated calculations. In these examples I will be using the base case of f(0) = f(1) = 1. Here is an example recursive tree for fibonacci(4), note the repeated computations: Non-Dy...

Java StringWriter class is a character stream that collects output from string buffer, which can be used to construct a string. The StringWriter class extends the Writer class. In StringWriter class, system resources like network sockets and files are not used, therefore closing the StringWriter i...

There are many ways to use MaterializeCSS framework. Few things to keep in mind before going to installation It is not a CSS only framwork, though it has CSS name in it. We can use its SCSS too It is not built for Angular It is a component framework too built on jquery. Though we are not supp...

It was most frequent question that can a same thread can be run twice. The answer for this is know one thread can run only once . if you try to run the same thread twice it will execute for the first time but will give error for second time and the error will be IllegalThreadStateException . exam...

docker-composer.yml web: ... env_file: - ./filename filename variable=value

You can find a complete reference which CSS3 components are supported on this page In order to use CSS3 in your project Compass provides mixins to support CSS3 features in every browser. On top of your Sass/Scss file you have to specify that you want to use compass @import "compass/css3"...