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minute after bootup;
added (+ 0.0) in days, hrs, mins, sec cases to change string to float for
comparison in if condition;
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previous data is not available;
added sub() statement to remove wall clock time from uptime command output;
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changed t_prev initial guess to use ck_boottime();
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collected from /proc/uptime;
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of ten in the last digit's place;
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added unc_g to algorithmically guess uncertainty when not available,
needs further testing and tuning;
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added prediction of t0 baed on new t_meas value;
merge t0 prediction with updated (measured) t0 rather than t0_prev;
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added seconds case for ck_uptime();
completed ck_time() function to allow different commands for checking time;
reverted t_meas estimation to basic subtraction method;
adjusted sleep timer from mod 30 to mod 60 in ckt0.sh;
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changed to merge_meas() of t_meas[] estimate when t[before] == t[after],
this provides a sub-second uncertainty when used with systime()
and helps derived estimates converge;
set shell script to use uncertainty based sleep time in main loop;
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refactored code, moving math from ck_uptime() to BEGIN block;
switched to using t_up(new) = t_up(old) + dt to predict uptime;
added conditional use of "date +%s.%N" to get t as float on FreeBSD;
merged some changes between ckt0.awk and ckcptime.awk;
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