Tutorial by Examples: l

npm init This will initialize a new NPM project for you - just press enter until it stops asking you questions. Now you'll notice that you have a new file called package.json. This file will, among other things, keep track of which packages or modules you've installed in your project.

Detailed instructions on getting join set up or installed.

The following command displays output only on the screen (stdout). $ ls The following command writes the output only to the file and not to the screen. $ ls > file The following command (with the help of tee command) writes the output both to the screen (stdout) and to the file. $ ls | ...

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...

You can pipe your output to multiple files (including your terminal) by using tee like this: $ ls | tee file1 file2 file3

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 cluster module allows one to start the same application multiple times. Clustering is desirable when the different instances have the same flow of execution and don't depend on one another. In this scenario, you have one master that can start forks and the forks (or children). The children work...

Child Processes are the way to go when one wants to run processes independently with different initialization and concerns. Like forks in clusters, a child_process runs in its thread, but unlike forks, it has a way to communicate with its parent. The communication goes both ways, so parent and chil...

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 ...

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...

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

app: ... environment: - var=value