The manual page and help for the hwclock Linux command. hwclock (Hardware Clock) is a basic command-line tool on Linux operating systems that allows you to manage the system's hardware clock (often referred to as RTC, or Real-Time Clock). This clock is a separate chip on the computer's motherboard that runs continuously, even when the system is turned off. With the help of hwclock, we can read and set the current time value of the hardware clock, which plays an important role in maintaining and synchronizing the system time.