[C] change console output?

[mekkatorqu]

I noticed that linux is capable of "updating" the output from console, e.g. when it downloads something, there's a text progress bar, how do I do that in my program? e.g. I have this code

int main()
{
    printf("line 1\n");
    printf("line2\n");
    printf("line3\n");
    printf("line 4\n");    

    return 0;
}

how do I make it update line2 and line3 to "line 2" and "line 3" ?

or is there a way to clear the console output? another way than printing thousands of new lines

[ne555]

You may use '\r' to go back to the start of the line and print the updated version.

[mekkatorqu]

what if the output is multiline?

[kbw]

Then you need to use something like ncurses.