Source code is human-readable instructions to the computer that describe how to perform a computation. Source code is expressed by using a programming language.

The following versions of the Hello World program written in three different programming languages cover major RPM Package Manager use cases:

• Hello World written in Bash

  The bello project implements Hello World in Bash. The implementation contains only the bello shell script. The purpose of this program is to output Hello World on the command line.

  The bello file has the following contents:

  #!/bin/bash
  
  printf "Hello World\n"

• Hello World written in Python

  The pello project implements Hello World in Python. The implementation contains only the pello.py program. The purpose of the program is to output Hello World on the command line.

  The pello.py file has the following contents:

  #!/usr/bin/python3
  
  print("Hello World")

• Hello World written in C

  The cello project implements Hello World in C. The implementation contains only the cello.c and Makefile files. The resulting tar.gz archive therefore has two files in addition to the LICENSE file. The purpose of the program is to output Hello World on the command line.

  The cello.c file has the following contents:

  #include <stdio.h>
  
  int main(void) {
      printf("Hello World\n");
      return 0;
  }