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Extra resources for Algorithms, graphs, and computers, Volume 62
Thus, Isof was not wrong in stating that no processes had the file foo open. The problem was that you asked the wrong question. Asking the right question is always a goal worth striving for. See the man pages for a more complete listing of the options and for many more examples. It should be noted that on some systems Isof will not show any files that are not opened by processes owned by the user. Thus, many of the preceding commands will not work (actually, they will work, but their output will not be complete).
More information on traceroute can be found in the man page. 6 tcpshow The output of tcpdump, as seen in the preceding examples and in Chapter 4, can be quite terse and require some experience to tease out the information. The tcpshow program is designed to provide a more human-readable format for the packets. 1063: . 2850371889:2850373345(1456) ack 2835338 win 18928 (DF) Now, consider the following result from tcpshow: 32 1. 136 TCP Header Source Port: 80 (www) Destination Port: 1063 «unknown» Sequence Number: 2850371889 Acknowledgement Number: 0002835338 Header Length: 20 bytes (data=1456) Flags: URG=off, ACK=on, PSH=off RST=off, SYN=off, FIN=off Window Advertisement: 18928 bytes Checksum: Ox4E68 Urgent Pointer: 0 TCP Data <*** Rest of data missing from packet dump ***> The information is in a much more human-readable format.
There are a number of implementations of the ping utility, but I will discuss the most common (ICMP) implementation. The standard usage is ping host Several "echo request" ICMP packets are sent to the host. The host replies with "echo reply" (unless a firewall or other security measure denies this or the machine is not responding or nonexistent), and the time between packets is computed. This gives an estimate for the time it takes for packets to transit between the machines. Packets will be sent until the user kills the program (one can specify the number of 28 1.
Algorithms, graphs, and computers, Volume 62 by Bellman