Tutorial by Topics: between



In R, tabular data is stored in data frames. This topic covers the various ways of transforming a single table.

Ajax uses the HTTP Protocol and can send requests using POST/GET methods from Client to Server.

WebSocket is itself a protocol to communicate between Client and Server, distinct from HTTP.

In Ajax when you send a request , server sends response for that request and connection ends.

Using WebSockets when you establish a connection with server , then you can communicate between client and server as much you want and it keeps connection alive.

Batch and bash are quite different. Batch flags are indicated with a /, while bash flags use a -. Capitalization matters in bash, but (almost) not at all in batch. Batch variable names can contain spaces, bash variable names can not. Ultimately, both are ways of manipulating and interacting with the command line. Not surprisingly, there is a reasonably-sized amount of overlap between the capabilities of the two systems.

Cryptography is used for security purposes. There are not so many examples of Encryption/Decryption in Python using IDEA encryption MODE CTR. Aim of this documentation :

Extend and implement of the RSA Digital Signature scheme in station-to-station communication. Using Hashing for integrity of message, that is SHA-1. Produce simple Key Transport protocol. Encrypt Key with IDEA encryption. Mode of Block Cipher is Counter Mode

We may use QML to build hybrid applications, since it's much more easier than C++. So we should know how they communicate with each other.

grep, egrep, fgrep, rgrep, pgrep - are commands in Unix-like operating systems that print lines matching a pattern. The grep searches the named input FILEs for lines containing a match to the given PATTERN. By default, it prints the matching lines. In addition, the variant programs egrep, fgrep, and rgrep are the same as grep -E, grep -F, and grep -r, respectively. These variants are deprecated, but are provided for backward compatibility.

MessageBox is a simple concept for decoupling entities.

For example entity A can place a message that entity B can read whenever suitable.

A view controller would like to talk to another view controller, but you don't want to create a strong or weak relationship.


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