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#include <fcntl.h> // open, close, O_WRONLY, ...
#include <unistd.h> // dup
#include <stdio.h> // printf
int main(int argc, char* argv[]) {
int f1 = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0755);
if (f1 < 0) {
perror("open");
return 1;
}
close(1);
int f2 = dup(f1);
if (f2 < 0) {
perror("dup");
return 2;
}
printf("Hello World!\n");
close(f1);
close(f2);
}
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