Tutorial by Examples: l

Basic Search Parameters with examples:

By default, the full indexed document is returned as part of all searches. This is referred to as the source (_source field in the search hits). If we don’t want the entire source document returned, we have the ability to request only a few fields from within source to be returned, or we can set _so...

Running GUI apps in a Linux container

By default, a Docker container won't be able to run a GUI application. Before that, the X11 socket must be forwarded first to the container, so it can be used directly. The DISPLAY environment variable must be forwarded as well: docker run -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$DISPLAY &...

Indent an entire file using built-in indentention engine

In command mode(Esc) enter :gg=G to use Vim's built-in indention engine. Command PartDescriptionggstart of file=indent (when equalprg is empty)Gend of file You can set equalprg in your .vimrc to use a more sophisticated auto-formatting tool. For example, to use clang-format for C/C++ put the foll...

Processing long running queries with Node

Since Node is single-threaded, there is a need of workaround if it comes to a long-running calculations. Note: this is "ready to run" example. Just, don't forget to get jQuery and install the required modules. Main logic of this example: Client sends request to the server. Server sta...

The importance of preallocation

Arrays in MATLAB are held as continuous blocks in memory, allocated and released automatically by MATLAB. MATLAB hides memory management operations such as resizing of an array behind easy to use syntax: a = 1:4 a = 1 2 3 4 a(5) = 10 % or alternatively a = [a, 10] a = ...

Value From App.Config

<asp:Literal runat="server" text="<%$ AppSettings:MyAppSettingName %>"/>

Evaluated Expression

<div> The time is now <%= DateTime.Now.ToString() %> </div>

Code Block Within ASP Markup

<div> <form id="form1" runat="server"> <% for (int i = 1; i <= 10; j++) { Response.Write(i) + " "; } %> </form> <div>

Word Count Example in Hive

Docs file (Input File) Mary had a little lamb its fleece was white as snow and everywhere that Mary went the lamb was sure to go. Hive Query CREATE TABLE FILES (line STRING); LOAD DATA INPATH 'docs' OVERWRITE INTO TABLE FILES; CREATE TABLE word_counts AS SELECT word, count(1) AS count F...

Hello world!

The example is taken from threejs website. You may want to download three.js and change the script source below. There are many more advanced examples under this link. HTML: <html> <head> <meta charset=utf-8> <title>My first Three.js app</title> <...

Reading files: foreach vs. while

When reading a potentially large file, a while loop has a significant memory advantage over foreach. The following will read the file record by record (by default, "record" means "a line", as specified by $/), assigning each one to $_ as it is read: while(<$fh>) { pri...

Processing long lists

If you have a list in memory already, the straightforward and usually sufficient way to process it is a simple foreach loop: foreach my $item (@items) { ... } This is fine e.g. for the common case of doing some processing on $item and then writing it out to a file without keeping the data ...

Installation on Amazon Linux from git repo

Amazon Linux is a RHEL variant, so the Red Hat instructions should work for the most part. There is, however, at least one discrepancy. There was an instance where the python27-devel package, as opposed to python-devel, was explicitly necessary. Here, we will install from source. sudo yum -y upd...

Creating an Connection to other Excel Files to query

There are many fine ways to get this done, which others have already suggested. Following along the "get Excel data via SQL track", here are some pointers. Excel has the "Data Connection Wizard" which allows you to import or link from another data source or even within the very ...

Verifying a Returned Value

[Test] public void Calculator_Add_ReturnsSumOfTwoNumbers() { Calculator calculatorUnderTest = new Calculator(); double result = calculatorUnderTest.Add(2, 3); Assert.AreEqual(5, result); }

Block access to LAN and out

docker network create -o "com.docker.network.bridge.enable_ip_masquerade"="false" lan-restricted Blocks Local LAN Internet Does not block Host running docker daemon (example access to 10.0.1.10:22)

Block access to other containers

docker network create -o "com.docker.network.bridge.enable_icc"="false" icc-restricted Blocks Containers accessing other containers on the same icc-restricted network. Does not block Access to host running docker daemon Local LAN Internet

Block access from containers to the local host running docker daemon

iptables -I INPUT -i docker0 -m addrtype --dst-type LOCAL -j DROP Blocks Access to host running docker daemon Does not block Container to container traffic Local LAN Internet Custom docker networks that doesn't use docker0

Block access from containers to the local host running docker daemon (custom network)

docker network create --subnet=192.168.0.0/24 --gateway=192.168.0.1 --ip-range=192.168.0.0/25 local-host-restricted iptables -I INPUT -s 192.168.0.0/24 -m addrtype --dst-type LOCAL -j DROP Creates a network called local-host-restricted which which: Blocks Access to host running docker daem...

Send Web notification using GCM ( Google Cloud Messaging System)

Such Example is knowing wide spreading among PWAs (Progressive Web Applications) and in this example we're going to send a simple Backend like notification using NodeJS and ES6 Install Node-GCM Module : npm install node-gcm Install Socket.io : npm install socket.io Create a GCM Enable...

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