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Another way:

int main(int argc, char *argv[])
{
char *message="Hello";
char *who="World!";
if(argc == 2)
{
who=argv[1];
}

...

#include <stdio.h>

int main (int argc, char *argv[])
{
char *message = "Hello ";
printf("%s ", message);

if(argc == 2)
{
printf("%s!\n", argv[1]);
}
else
{
...

It seems to be clearer now where your problem was: between what you called "built-in" programs (I'd call it "system provided executables" and other executable programs there is absolutely no...

I do not understand how perderabo has earned your ridicule by honestly trying to help you. If you do not understand it than this is probably more your fault than it is his, no?

Having said this:...

A typical call to execl might be something like this:execl("/bin/date", "date", 0, 0);

The first argument is a path to a file to be executed. Did I understand that you made the first argument a...