Nirutechnolabs

find command examples

# find -iname "MyCProgram.c"

$ find -iname "MyCProgram.c" -exec md5sum {} \;

# find ~ -empty

grep command examples

$ grep -i "the" demo_file

$ grep -A 3 -i "example" demo_text

$ grep -r "ramesh" *

tar command examples

Create a new tar archive.

$ tar cvf archive_name.tar dirname/

Extract from an existing tar archive.

$ tar xvf archive_name.tar

View an existing tar archive.

$ tar tvf archive_name.tar

History Of SAP Software

From day one, SAP was created as a global software product.
The software was engineered on a multilingual and multinational platform. 
Only a few years after its core product hit the marketplace the SAP become Germany's top software vendor.
 
SAP AG also offers comprehensive industry solutions besides regular SAP software (ECC products).
Examples are SAP Aerospace & Defense, SAP Automotive, SAP Banking, SAP Chemicals, SAP Consumer Products, SAP Engineering & Construction, SAP Healthcare, SAP High Tech, SAP Insurance, SAP Media, SAP Oil & Gas, SAP Pharmaceuticals, SAP Public Sector, SAP Retail, SAP Service Provider, SAP Telecommunications, SAP Utilities.
 
WebAS is very flexible.
Due to this flexibility an orgranization can initially choose to deploy SAP system very similar to how they do business today, and then gradually evolve business model over time.  
 
Client/server is of a few architectures available. 
In a client/server environment, a client machine requests information, via network, from the supplying machine, known as the server. 
A client machine could be an individual PC, workstation, mobile computing device, or even another computer system.
 
Img1
 
The three-tiered architecture divides the architecture into three layers: 
·         The user interface layer 
·         The business logic layer ("application" layer) 
·         The database layer
 
Img2
 
The four-tiered system enables simple browser-based access.
This laywer helps in reducing the expense associated with installing, patching, and upgrading the SAP GUI user interface across perhaps hundreds or thousands of desktops.
Also it helps to integrate web services into the overall architecture.
 
Designing an adaptable enterprise computing solution is now possible using ESA. 
Using ESA, SAP R/3 and other legacy SAP solutions can be plugged in as application services. 
 
 

Java is widely used robust technology. let's start learning java from basic like what is java, core java where it is used, what type of applications are created in java and why we use java.

first of let's see what is java..?

Java is programming language and a platform. java is high level, robust secured and object oriented programming language.

Platform any hardware or software environment in which a program runs is known as platform. since has its own environment(JRE) and API. It is called platform.

Now onward let's see one example to know better idea will came.

Class Simple{
   Public static void main(String args[]) {
      System.out.println("Hello Ravi");
   }
 }

Out put is here:

Compile by : javac Simple.java
Run by : java Simple

Hello Ravi

Where is is used ?

Accordingly to sun, 3 billion devices run java. there are many devices where java is currently used. some of them are as follows:

1. Desktop Applications such as acrobat reader, media player, antivirus and many popular software.
2. Web applications such as irctc.co.in etc
3. Enterprise Applications such as banking applications 
4. Mobile
5. Embedded System 
6. Smart Card
7. Robotics
8. Game etc 

Types of Java Applications

There are mainly four type applications that can be crated using java programming :

1: Standalone Applications 
It's also known as desktop application or window-based applications. an application that we need to install every machine such as media player antivirus etc. AWT and Swing are used in java creating standalone applications

 2:Web Applications
An application that runs on the server side and creates dynamic page is called web applicaion. currently servlet , jsp struts, jsf etc. technologies are used creating web application in java

3:Enterprise Application 
An application that is distributed in nature, such as banking applications etc. IT has the advantage of high level security load balancing and clustering. in java EJB is used for creating enterprise applications.

4:Mobile Application
An application that is created for mobile devices. currently android and java ME are used for creating mobile applications.

History of Java

Java is interesting to know the history if java starts from green team. java team