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@node calc_tickadj Invocation
@section Invoking calc_tickadj
@pindex calc_tickadj
@cindex Calculates "optimal" value for tick given ntp drift file.
@ignore
#
# EDIT THIS FILE WITH CAUTION (invoke-calc_tickadj.texi)
#
# It has been AutoGen-ed November 21, 2016 at 07:58:38 AM by AutoGen 5.18.5
# From the definitions calc_tickadj-opts.def
# and the template file agtexi-cmd.tpl
@end ignore
The @code{calc_tickadj} script uses provided ntp drift file to generate optimal
tick value. Generally, ntpd can do better job if the drift value is the
smallest possible number.
The example output of
@example
$ ./calc_tickadj
81.699 (drift)
9999 usec; 9999779 nsec
$ cat /etc/ntp/drift
-23.159
@end example
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.
@code{calc_tickadj} tries to determine the the tick value by using
@code{tickadj} program from ntp package. If this doesn't work you can specify
current tick manually on command line.
This section was generated by @strong{AutoGen},
using the @code{agtexi-cmd} template and the option descriptions for the @code{calc_tickadj} program.
@menu
* calc_tickadj usage:: calc_tickadj help/usage (@option{--help})
* calc_tickadj drift-file:: drift-file option (-d)
* calc_tickadj tick:: tick option (-t)
* calc_tickadj exit status:: exit status
@end menu
@node calc_tickadj usage
@subsection calc_tickadj help/usage (@option{--help})
@cindex calc_tickadj help
This is the automatically generated usage text for calc_tickadj.
The text printed is the same whether selected with the @code{help} option
(@option{--help}) or the @code{more-help} option (@option{--more-help}). @code{more-help} will print
the usage text by passing it through a pager program.
@code{more-help} is disabled on platforms without a working
@code{fork(2)} function. The @code{PAGER} environment variable is
used to select the program, defaulting to @file{more}. Both will exit
with a status code of 0.
@exampleindent 0
@example
calc_tickadj - Calculates "optimal" value for tick given ntp drift file. - Ver. 4.2.7p467
USAGE: calc_tickadj [ -<flag> [<val>] | --<name>[@{=| @}<val>] ]...
-d, --drift-file=str Ntp drift file to use
-t, --tick=num Tick value of this host
-?, --help Display usage information and exit
--more-help Pass the extended usage text through a pager
Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.
@end example
@exampleindent 4
@node calc_tickadj drift-file
@subsection drift-file option (-d)
@cindex calc_tickadj-drift-file
This is the ``ntp drift file to use'' option.
This option takes a string argument.
Use the specified drift file for calculations
@node calc_tickadj tick
@subsection tick option (-t)
@cindex calc_tickadj-tick
This is the ``tick value of this host'' option.
This option takes a number argument.
The current tick which to adjustment will be calculated
@node calc_tickadj exit status
@subsection calc_tickadj exit status
One of the following exit values will be returned:
@table @samp
@item 0 (EXIT_SUCCESS)
Successful program execution.
@item 1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
@end table
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