===== Hello World in C =====

  - First of all we need to install gcc: GNU Compiler Collection
  - At the beginning, update the packages by typing <code> apt-get update </code> 
  - Subsequently install the compiler by typing <code> apt-get install gcc </code>   
  - Now create and open a .c file using nano editor <code> nano hello.c </code>
  - Type following code: <code c hello.c >#include <stdio.h> 
int main() 
{
	printf("Hello World");
	return 0; 
}
</code> 
  - Save it using Ctrl + O (German keyboard: Strg + O)
  - Exit using Ctrl + X (German keyboard: Strg + X)
  - Compile the program using gcc <code> gcc hello.c -o hello </code>
  - Type <code> ls -l </code>
  - The created file has rights 644. Change it to 755 <code> chmod 755 hello </code>
  - Type <code> ./hello </code> to run the program

===== Hello World shell script =====

  - Create and open file using nano editor <code> nano helloBash </code>
  - Type following code: <code bash helloBash >   
#!/bin/bash
echo "Hello World"
</code>
  - Save it using Ctrl + O (German keyboard: Strg + O)
  - Exit using Ctrl + X (German keyboard: Strg + X)
  - Type <code> ls -l </code>
  - The created file has rights 644. Change it to 755 <code> chmod 755 helloBash </code>
  - Type <code> ./helloBash </code> to run the program





===== Hello World in Python =====

  - First of all we need to install Python
  - At the beginning, update the packages by typing <code> apt-get update </code> 
  - Subsequently install Python by typing <code> apt-get install python </code>
  - Create and open a .py file using nano editor <code> nano helloPt.py </code>
  - Type following code: <code python helloPt.py> print "Hello World" </code>
  - Save it using Ctrl + O (German keyboard: Strg + O)
  - Exit using Ctrl + X (German keyboard: Strg + X)
  - Run the program using <code> python helloPt.py </code>