Create hwclock.md

pages/linux/hwclock.md

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+# hwclock
+
+> Used for reading or changing the hardware clock.  Usually requires root.
+
+- Display the current time as reported by the hardware clock:
+
+`hwclock`
+
+- Write the current software clock time to the hardware clock (sometimes used during system setup):
+
+`hwclock --systohc`
+
+- Write the current hardware clock time to the software clock:
+
+`hwclock --hctosys`