Library Unistd — H

: Essential for freeing up file descriptors to prevent system leaks.

: Replaces the current process image with a new one (how your terminal launches other apps). getpid() : Tells the program its own unique process ID. ⏱️ System & Time Library Unistd H

: Checks if a file descriptor is actually a terminal (useful for deciding if you should print colorful text). ⚠️ Pro-Tip: Portability : Essential for freeing up file descriptors to