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Shell Programming and Scripting
sed/awk changing values
Post 302552067 by BeefStu on Thursday 1st of September 2011 01:50:02 PM
09-01-2011
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LEARN ABOUT LINUX
clockdiff
CLOCKDIFF(8) System Manager's Manual: iputils CLOCKDIFF(8) NAME
clockdiff - measure clock difference between hosts SYNOPSIS
clockdiff [-o] [-o1] destination DESCRIPTION
clockdiff Measures clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP TIMESTAMP option [3] option added to ICMP ECHO. [1] OPTIONS
-o Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP messages. It is useful with some destinations, which do not support ICMP TIMESTAMP (f.e. Solaris <2.4). -o1 Slightly different form of -o, namely it uses three-term IP TIMESTAMP with prespecified hop addresses instead of four term one. What flavor works better depends on target host. Particularly, -o is better for Linux. WARNINGS
o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes timestamps mostly useless. o Some nodes generate messed timestamps (Solaris>2.4), when run xntpd. Seems, its IP stack uses a corrupted clock source, which is synchro- nized to time-of-day clock periodically and jumps randomly making timestamps mostly useless. Good news is that you can use NTP in this case, which is even better. o clockdiff shows difference in time modulo 24 days. SEE ALSO
ping(8), arping(8), tracepath(8). REFERENCES
[1] ICMP ECHO, RFC0792, page 14. [2] ICMP TIMESTAMP, RFC0792, page 16. [3] IP TIMESTAMP option, RFC0791, 3.1, page 16. AUTHOR
clockdiff was compiled by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It was based on code borrowed from BSD timed daemon. It is now main- tained by YOSHIFUJI Hideaki <yoshfuji@skbuff.net>. SECURITY
clockdiff requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-uid root. AVAILABILITY
clockdiff is part of iputils package and the latest versions are available in source form at http://www.skbuff.net/iputils/iputils-cur- rent.tar.bz2. iputils-101006 12 April 2011 CLOCKDIFF(8)