ANONYMOUS wrote: There's no definition of a trojan-horse that you need to detect in your code. You're being asked to find/report any command names that each appear more than once in the directory names indicated by the value of PATH variable. If any particular filename appears more than once, then at least one of the instances is simply *suspected* of being a trojan-horse. There's no tips or magic 'formula' indicating when to use fork(). Its use enables either: - both the original parent and new child processes to execute the same code, at their own rate, OR - for the child process to be overlaid with a call to ``execve()``` to run a different program.