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Full Discussion: Script to detect time drift
Operating Systems HP-UX Script to detect time drift Post 303019023 by Green_Star on Thursday 21st of June 2018 11:52:42 AM
Old 06-21-2018
Thanks a lot Bakunin. That really helps me understand the background!!!

---------- Post updated at 11:52 AM ---------- Previous update was at 09:57 AM ----------

Quote:
Originally Posted by MadeInGermany
Looks like the "ntpq -c rl" changes with every update of the NTP package.
Take the "ntpq -pn" output instead! To be processed like this in the shell script:
Code:
offset=$(
ntpq -pn | awk '/^[*]/ {print $9}'
)

Just wondering what would be the value of "offset" using "ntpq -pn" if NTP service is down? Will it be 0 or BLANK?
Command "awk" will print the 9th value of the output "ntpq -pn". So just wondering if NTP service is down, and the offset is BLANK, awk will print "disp" value to the output variable instead of BLANK. Thanks for your time.
 

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X_SOLVE_DC_DRIFT(1gmt)					       Generic Mapping Tools					    X_SOLVE_DC_DRIFT(1gmt)

NAME
x_solve_dc_drift - Find Best-fitting D.C.-shift and Drift Estimates SYNOPSIS
x_solve_dc_drift [ -Xxbase ] [ -Llbase ] [ -Iignorefile ] [ -S ] [ -Citeration ] [ -Mmin_nx ] [ -Rwest/east/south/north ] [ -Uuselegsfile ] [ -V ] [ -Bbinfile ] [ -AASCIIfile ] DESCRIPTION
x_solve_dc_drift will read the database files and, by iterating, find the best-fitting regression line to the <time,COE> points for each leg that minimizes the overall standard deviation of the data set in a least squares sense. Finally, correction file(s) are created. -X Indicate an alternate database to read. [Default is xx_base.b]. -L Indicate an alternate legbase to read. [Default is xx_legs.b]. -I Ignore information for certain legs (that might be bad, etc). -S Reset the old d.c.-shift and drift estimates to zero before iterating. -C Specify how many iterations to do. Default is interactive session. -M Solve for drift only if the leg has more than min_nx cross-overs. -R Only take COEs inside this region into account. [Default is world]. -U Solve for corrections involving COEs from legs in the uselegsfile only. -B Create a binary correction file (which can be read by x_list and gmtlist). -A Create an ASCII correction table. At least one of -A and -B must be specified. -V Selects verbose mode, which will send progress reports to stderr [Default runs "silently"]. BEWARE
The reason for the -M option is that if the COEs are few, then a stable estimate of the slope may not be obtained (e.g. when most of the COEs occur midway between ports). However, in most cases the bulk of the COEs do occur near the ports so that a drift estimate can be com- puted. Conventional wisdom recommends plotting the time-series and the computed regression line to see if it makes sense. SEE ALSO
GMT(1), x_system(1) REFERENCES
Wessel, P. XOVER: A Cross-over Error Detector for Track Data, Computers & Geosciences, 15, 333-346. GMT 4.5.7 15 Jul 2011 X_SOLVE_DC_DRIFT(1gmt)
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