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Top Forums Shell Programming and Scripting awk - Print whole string ending with a Tab if key matched Post 302933284 by RudiC on Thursday 29th of January 2015 05:36:53 AM
Old 01-29-2015
Rats - you're absolutely right! That one single empty line went past me as well ...

Still the requestor complains about the file2 record not being printed together with the "77" . I can see why now: The script populates array a with the lines from file2, but in the function it prints array line which is empty...
 

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SC_TRACEDIFF(1) 					    BSD General Commands Manual 					   SC_TRACEDIFF(1)

NAME
sc_tracediff -- display traceroute paths where the path has changed. SYNOPSIS
sc_tracediff [-a] [-m method] [-n] file1.warts file2.warts DESCRIPTION
The sc_tracediff utility displays pairs of traceroutes to a destination where the path has changed. It takes two warts files as input and displays paths where a hop differs by its address. The options are as follows: -a dump all traceroute pairs regardless of whether they have changed. -m method specifies the method used to match pairs of traceroutes together. If dst is specified, traceroutes are matched if the destination IP address of both traces are the same. If userid is specified, traceroutes are matched if the userid field of both traces are the same. If dstuserid is specified, traceroutes are matched if the destination IP address and userid fields are the same. By default, the destination IP address is used. -n names should be reported instead of IP addresses, where possible. sc_tracediff can be useful in network monitoring to identify when a forward IP path has changed. In this scenario, it is recommended that Paris traceroute is used with the same UDP source and destination ports for each execution of scamper so that only paths that have changed are identified, not merely alternate paths visible due to per-flow load-balancing. By default scamper uses a source port based on the process ID, which will change with each execution of scamper. EXAMPLES
The command: scamper -O warts -o file1.warts -c 'trace -P udp-paris -s 31337' -f list.txt collects the forward IP paths towards a set of IP addresses found in list.txt using 31337 as the UDP source port value. If the above command is adjusted to subsequently collect file2.warts, then we can identify paths that have subsequently changed with the command: sc_tracediff file1.warts file2.warts If Paris traceroute with ICMP probes is preferred, then the following invocation of scamper is appropriate: scamper -O warts -o file1.warts -c 'trace -P icmp-paris -d 31337' -f list.txt In this case, scamper uses 31337 as the ICMP checksum value in each probe. SEE ALSO
scamper(1), B. Augustin, X. Cuvellier, B. Orgogozo, F. Viger, T. Friedman, M. Latapy, C. Magnien, and R. Teixeira, Avoiding traceroute anomalies with Paris traceroute, Proc. ACM/SIGCOMM Internet Measurement Conference 2006. AUTHOR
sc_tracediff is written by Matthew Luckie <mjl@luckie.org.nz>. BSD
April 21, 2011 BSD
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