hagit_guy@hotmail.com (Hagit) writes:

]Hi
]Im having a problem in understanding the relation between the RTC and
]the kernel time.

None.

]When the user call the "date" shell command to update the kernel time,
]is the RTC is updated too? and vice versa, is setting the RTC via

No. No.

]/dev/rtc updated the kernel time?

On many systems system time is initially set from the rtc. But there is
no other relationship between them.
there exist commands to manipulate the hardware clock (hwclock) and
commands to manipulate the system clock (date).

There exist programs which a) set the system clock from outside sourced
(ntp, chrony) and which calibrate the hardware clock from outside
sources (chrony).