Tutorial by Examples: re

From inside the interative Julia shell (also known as REPL), you can access the system's shell by typing ; right after the prompt: shell> From here on, you can type any shell comand and they will be run from inside the REPL: shell> ls Desktop Documents Pictures Templates Downloa...

brew install zsh sudo echo '/usr/local/bin/zsh' >> /etc/shells chsh -s /usr/local/bin/zsh

Puppet is a configuration management solution. Users describe the desired state of a server or software and configuration management achieves this state. This brings following advantages: Configurations can be reproduced exactly the same every time, as many times as necessary Configurations for ...

This works well for single level right click context menu. All you need to do is create a registry entry under Classes Root HKEY_CLASSES_ROOT for specific extension. If you want to create a entry for all types of files choose * else choose extension like .pdf etc. var regmenu = Registry.ClassesR...

Problem Cross-Site Request Forgery or CSRF can force an end user to unknowingly generate malicious requests to a web server. This attack vector can be exploited in both POST and GET requests. Let's say for example the url endpoint /delete.php?accnt=12 deletes account as passed from accnt parameter ...

The chart consists out of HTML container and the JavaScript code that instantiates a chart in it. HTML We use a <div> element as chart container. <div id="chartdiv" style="height: 300px;"></div> JavaScript To instantiate the chart we use AmCharts.makeChar...

You can concatenate strings separated by delimiter using the string_agg() function. If your individuals table is: NameAgeCountryAllie15USAAmanda14USAAlana20Russia You could write SELECT ... GROUP BY statement to get names from each country: SELECT string_agg(name, ', ') AS names, country FROM ...

Bash can easily create lists from alphanumeric characters. # list from a to z $ echo {a..z} a b c d e f g h i j k l m n o p q r s t u v w x y z # reverse from z to a $ echo {z..a} z y x w v u t s r q p o n m l k j i h g f e d c b a # digits $ echo {1..20} 1 2 3 4 5 6 7 8 9 10 11...

CREATE TABLE users (username text, email text); CREATE TABLE simple_users () INHERITS (users); CREATE TABLE users_with_password (password text) INHERITS (users); Our three tables look like this: users ColumnTypeusernametextemailtext simple_users ColumnTypeusernametextemailtext users_with_p...

With AspNetCore you can develop the application on any platform including Mac,Linux,Window and Docker. Installation and SetUp Install visual Studio Code from here Add C# extesnion Install dot net core sdk. You can install from here Now you have all the tools available. To develop the applic...

While the String.Format() method is certainly useful in formatting data as strings, it may often be a bit overkill, especially when dealing with a single object as seen below : String.Format("{0:C}", money); // yields "$42.00" An easier approach might be to simply use the To...

After launching Visual Studio 2015, go to File → New → Project. In the New Project dialog box, browse in the templates tree to Visual C# → Windows → Universal and select Blank App (Universal Windows). Next, we need to fill the form to describe the Application: Name: this is the name of the appli...

JavaFX provides an easy way to internationalize your user interfaces. While creating a view from an FXML file you can provide the FXMLLoader with a resource bundle: Locale locale = new Locale("en", "UK"); ResourceBundle bundle = ResourceBundle.getBundle("strings", loc...

The time for Scheduler Tasks are measured in Ticks. Under normal conditions, there are 20 ticks per second. Tasks scheduled with .scheduleSyncRepeatingTask will be run on the Main Thread Bukkit.getScheduler().scheduleSyncRepeatingTask(plugin, new Runnable() { @Override public void run(...

The Java SE Development Kit (JDK) 7 Update 10 (or later) or JDK 8 is required to install NetBeans IDE. You can download the latest update of JDK 7 and JDK 8 at http://www.oracle.com/technetwork/java/javase/downloads. The PHP and C/C++ NetBeans bundles only require the Java Runtime Environment (JRE)...

If you have multiple libraries in the same solution, you can add local (project) references between them: { "dependencies": { "NETStandard.Library": "1.6.0", "MyOtherLibrary": { "target": "project" } }...

The summation 1/1 + 1/2 + 1/3 + 1/4 + ... + 1/n is equal to the nth harmonic number, denoted Hn. The nth harmonic number obeys the inequalities ln (n + 1) ≤ Hn ≤ (ln n) + 1 and therefore Hn = Θ(log n). The harmonic numbers often arise in the analysis of algorithms, with randomized quicks...

The summation 1/1 + 1/4 + 1/9 + 1/16 + ... out to infinity converges to π2 / 6, and therefore any summation of the form 1/1 + 1/4 + 1/9 + 1/16 + ... + 1/n2 is Θ(1).

You can use other operators besides $set when updating a document. The $push operator allows you to push a value into an array, in this case we will add a new nickname to the nicknames array. db.people.update({name: 'Tom'}, {$push: {nicknames: 'Tommy'}}) // This adds the string 'Tommy' into the n...

If two pointers are compared using <, >, <=, or >=, the result is unspecified in the following cases: The pointers point into different arrays. (A non-array object is considered an array of size 1.) int x; int y; const bool b1 = &x < &y; // unspecified int ...