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Which Hwclock option sets the system time to the current hardware clock time?
Linux + Exam 2.4
| Question | Answer |
|---|---|
| Recently you updated the /etc/aliases file with several email aliases. Which command should you use to update /etc/aliases.db file? | newaliases |
| Which hwclock option sets the system time to the current hardware clock time? | -s |
How do I set hardware time in Linux?
- Using the date Command. Use the date command to display or set your Linux system time.
- Using the hwclock Command. Use the hwclock command to display or set your Linux system time, display or set your PC’s hardware clock, or to synchronize the system and hardware times.
- Changing the Time and Date.
How to keep the hardware clock synchronized with system time when using NTP?
How can I keep the hardware clock synchronized with system time when NTP is being used? The /etc/sysconfig/ntpd file contains the SYNC_HW CLOCK setting which determines if the hardware clock updates every time NTP synchronizes the system time. By default, the setting is off as shown below:
How does ntpd work in one time mode?
ntpd normally operates continuously while monitoring for small changes in frequency and trimming the clock for the ultimate precision. However, it can operate in a one-time mode where the time is set from an external server and frequency is set from a previously recorded frequency file.
What is the theoretical precision of ntpd synchronization?
The ntpd utility can synchronize time to a theoretical precision of about 232 picoseconds. In practice, this limit is unattainable due to quantum limits on the clock speed of ballistic-electron logic. Ordinarily, ntpd reads the ntp.conf (5) configuration file at startup time in order to determine the synchronization sources and operating modes.
Which is version 4 of the Network Time Protocol ( NTP )?
It is a complete implementation of the Network Time Protocol (NTP) version 4, as defined by RFC 5905, but also retains compatibility with version 3, as defined by RFC 1305, and versions 1 and 2, as defined by RFC 1059 and RFC 1119, respectively. The ntpd utility can synchronize time to a theoretical precision of about 232 picoseconds.