Language C
#include <stdio.h> //Library for using standard input and output
int main(int argc, char* argv[]){ //function main which is executed first when the program is invoked
//it receives 2 parameters, the first one is the counter of arguments
//the second one is an array of arguments from command line
printf("Hello world!\nby %s\n", argv[1]); //We say Hello and print the second parameter from char array argv[] of
//arguments from command line
return 0; //the function returns the integer zero and everything it's ok
}//End of the program
