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Top Forums Shell Programming and Scripting reverse search a text file from a specified line Post 302230102 by era on Thursday 28th of August 2008 04:05:57 PM
Old 08-28-2008
Code:
vnix$ awk '/PROCESSING/ { lastb=$0 } /ERROR/ { print lastb; print; lastb="" }' <<HERE
> 1 useless line....
> 2 useless line....
> 3 useless line....
> 4 PROCESSING PART 111
> 5 useless line....
> 6 useless line....
> 7 ERROR processing part!
> 8 useless line....
> 9 useless line....
> 10 PROCESSING PART 222
> 11 useless line....
> 12 useless line....
> 13 useless line....
> 14 useless line....
> 15 SUCCESS!
> 16 PROCESSING PART 333
> 17 useless line....
> 18 useless line....
> 19 SUCCESS!
> 20 PROCESSING PART 444
> 21 useless line....
> 22 useless line....
> 23 ERROR processing part!
> 24 PROCESSING PART 555
> 25 useless line....
> 26 useless line....
> 27 SUCCESS!
> 28 useless line....
> 29 useless line....
> 30 useless line....
> 31 useless line....
> HERE
4 PROCESSING PART 111
7 ERROR processing part!
20 PROCESSING PART 444
23 ERROR processing part!

Note the minor change I made in the printing order (they would come out with the ERROR before the PROCESSING line in the original script).
 

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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. 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)
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