SIMPLE SOLUTIONS

# CALC_TICKADJ - reference manual online

Calculates optimal value for tick given ntp drift file.

Chapter
21 Oct 2015
```calc_tickadj(1calc_tickadjman)            User Commands            calc_tickadj(1calc_tickadjman)

NAME
calc_tickadj - Calculates optimal value for tick given ntp drift file.

SYNOPSIS
calc_tickadj [-flags] [-flag [value]] [--option-name[[=| ]value]]

All arguments must be options.

DESCRIPTION
The calc_tickadj script uses provided ntp drift file to generate optimal tick value. Gen‐
erally, ntpd can do better job if the drift value is the smallest possible number.

The example output of
81.699 (drift)
9999 usec; 9999779 nsec
\$ cat /etc/ntp/drift
-23.159

means the following. If tick on that box is 10,000, by making the value 9999 we'll shift
the box from its current drift of -23.159 to a drift of 81.699, and in doing so we'll
speed the clock up a little every second instead of slowing the clock down a little.

If 'tick' on that box is 10,000,000 then by setting it to 9999779 the drift value will be
somewhere around 0.0.

calc_tickadj tries to determine the the tick value by using tickadj program from ntp pack‐
age. If this doesn't work you can specify current tick manually on command line.

OPTIONS
-d string, --drift-file=string
Ntp drift file to use.  The default string for this option is:
/etc/ntp/drift

Use the specified drift file for calculations

-t number, --tick=number
Tick value of this host.  This option takes an integer number as its argument.

The current tick which to adjustment will be calculated

-?, --help
Display usage information and exit.

-!, --more-help
Pass the extended usage information through a pager.

-v [{v|c|n --version [{v|c|n}]}]
Output version of program and exit.  The default mode is `v', a simple version.
The `c' mode will print copyright information and `n' will print the full copyright
notice.

EXIT STATUS
One of the following exit values will be returned:

0  (EXIT_SUCCESS)
Successful program execution.

1  (EXIT_FAILURE)
The operation failed or the command syntax was not valid.

70  (EX_SOFTWARE)