Your company here — click to reach over 10,000 unique daily visitors

ntpwait - Man Page

wait for ntpd to stabilize the system clock


ntpwait [-vV] [-n number] [-s secs]


The ntpwait program blocks until ntpd is in synchronized state. This can be useful at boot time, to delay the boot sequence until after "ntpd -g" has set the time.

ntpwait will send at most number queries to ntpd(8), sleeping for secs seconds after each status return that says ntpd(8) has not yet produced a synchronized and stable system clock.

ntpwait will do this quietly, unless the -v flag is provided.


-n number, --tries=number

Number of times to check ntpd. This option takes an integer number as its argument. The default number for this option is: 100.

The maximum number of times we will check ntpd to see if it has been able to synchronize and stabilize the system clock.

-s secs-between-tries, --sleep=secs-between-tries

How long to sleep between tries. This option takes an integer number as its argument. The default secs-between-tries for this option is: 6.

We will sleep for secs-between-tries after each query of ntpd that returns "the time is not yet stable".

-v,  --verbose

Be verbose.

By default, ntpwait is silent. With this option, ntpwait will provide status information, including time to synchronization in seconds.

-V,  --version

Print the version string and exit.


If you are running Python at a version older than 3.3, the report on time to synchronization may be thrown off by NTP clock stepping.

Exit Status

One of the following exit values will be returned:


Successful program execution.


The operation failed or the command syntax was not valid.


Operation was interrupted by signal.

Referenced By


2024-06-07 NTPsec