NTPSHMMON(1) GPSD Documentation NTPSHMMON(1) (NAME) ntpshmmon - gpsd refclock ntpd (SYNOPSIS) ntpshmmon [OPTIONS] ntpshmmon -h ntpshmmon -V (DESCRIPTION) (shared-memory) gpsd(8) refclock ntpd ( ) . ntpd . ntpd ntpd . ntpshmmon NTP0 NTP1 (root) . NTP2 NTP3 . (interrupt) . (whitespace) . : ntpshmmon version 3.18 # Name Seen@ Clock Real L Pre sample NTP2 1424926256.443030206 1424926256.115869233 1424926256.000000000 0 -1 sample NTP3 1424926256.443060517 1424926255.995430821 1424926256.000000000 0 -20 sample NTP3 1424926256.995747347 1424926256.995422728 1424926257.000000000 0 -20 sample NTP2 1424926257.112433572 1424926257.111936726 1424926257.000000000 0 -1 sample NTP3 1424926257.996221153 1424926257.995410232 1424926258.000000000 0 -20 sample NTP2 1424926258.107769409 1424926258.107451006 1424926258.000000000 0 -1 sample NTP3 1424926258.995647636 1424926258.995406476 1424926259.000000000 0 -20 <> . . # . : 1. <> 2. NTP . 3. . 4. . 5. . 6. (leap-second). 7. ( /jitter ). << >> (clock time) << >> (receiver time) . UTC . . -o <> <> . <> <> <> . (OPTIONS) -?, -h, --help . -n COUNT, --count COUNT COUNT. -o, --offset <> <>. <> <> <> . -s, --rmshm SHM GPSD. GPSD . -t SECONDS, --seconds SECONDS SECONDS. -v, --verbose (verbose). -V, --version . (EXIT STATUS) 0 . 1 . (SEE ALSO) gpsd(8), gps(1) (RESOURCES) : (COPYRIGHT) GPSD () SPDX-License-Identifier: BSD-2-clause (AUTHORS) Eric S. Raymond GPSD, Version 3.27.5 2025-11-04 NTPSHMMON(1)