- About hwclock : To query and set the hardware clock (RTC)
- It comes from “util-linux-ng-2.17.2” package.
Examples:
1. To see the hardware clock
| $ hwclock |
2. To read the Hardware Clock and print the time on Standard Output
| $ hwclock -r $ hwclock –show |
3. To set the Hardware Clock to the time given by the –date option
| $ hwclock –date=”” |
4. To set the system time from the hardware clock
| $ hwclock -s $ hwclock –hctosys |
5. To set the hardware clock to current system time
$ hwclock -w
$ hwclock –systohc
6. To reset the system time based on current timezone
| $ hwclock –systz |
7. To Add or subtract time from the Hardware Clock to account for systematic drift
| $ hwclock –adjust |
8. To Print the kernelâs Hardware Clock epoch value to standard output
| $ hwclock –getepoch |
9. To Set the kernel’s Hardware Clock epoch value to the value specified
| $ hwclock –setepoch–epoch=1970 |
10. To get the version of hwclock
| $ hwclock -v $ hwclock –version |
11. To keep hardware clock in localtime
$ hwclock –localtime
12. To disable the facilities provided by “/etc/adjtime.”
| $ hwclock –noadjfile |
13. To overrides the default /etc/adjtime
| $ hwclock –adjfile=filename |
14. To overrides the default /dev file name, which is /dev/rtc
| $ hwclock -f $ hwclock –rtc=filename |
15. To set hardware clock year storing range
| $ hwclock –badyear |
16. To specify the most common epoch
| $ hwclock –srm |
17. To to specify the most common epoch
| $ hwclock –arc |
18. To test the hardware clock
| $ hwclock –test |
19. To debug the hardware clock
| $ hwclock –debug |
