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Top Forums Shell Programming and Scripting Show date/time with tail|grep command Post 302296020 by jim mcnamara on Tuesday 10th of March 2009 07:16:34 AM
Old 03-10-2009
Ok- then you tell us how to know when the line in the logfile was written. If the file was written out over a period of time the file mtime is LAST time it was written to - the time for the last line in the file - not the time a given line was written.

Without timestamps or some other file with timestamps you cannot get anything but a file mtime - or a ctime which in this case is pretty much useless.
 

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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. 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 for anonymous ftp ftp://ftp.inr.ac.ru/ip-rout- ing/iputils-current.tar.gz. iputils-021109 09 iINAON 2002 CLOCKDIFF(8)
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