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Most people who are familiar with Ethereal tend to use the Ethereal Graphical User Interface (GUI). However, when Ethereal is installed it also comes with several other supporting programs: the command line version of Ethereal, called Tethereal, and three other programs to assist you in manipulating capture files; editcap, mergecap, and text2pcap. These supporting programs can be used together to provide very powerful capture file manipulation. For example, files can be captured with Tethereal, edited with editcap, and merged into a single packet capture file with mergecap. They can then be viewed with Tethereal or Ethereal. As you read this chapter you will see the vast capabilities and the granular control these supporting programs give you when manipulating capture files.
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