Apr 022012
 

William E. Shotts, Jr., published a few years ago a useful ebook entitled “The Linux Command Line”, a guide to learn and know more about the Command Line Interface (CLI) on GNU / Linux. The ebook is still available for download and is released under a Creative Commons license.

Although most distributions have graphical environments and interfaces for applications, the command line continues to be a useful tool to do various tasks while using the system. Even the combination of GUI and command line interface, well used, can help you to perform the tasks that you need quickly and accurately.
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Mar 062012
 

Article by http://itechmasters.blogspot.com

Here are some free, open-source, and useful network tools for Linux:

1) tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license. The tcpdump command has a lot of advanced features, most of which revolve around filtering and finding a needle in a haystack of packets. If you run tcpdump on a remote machine, your screen will be flooded with all the ssh traffic between your client and the remote machine. To get started without having to learn too much about how tcpdump filtering works, run the following command:

sudo tcpdump | grep -v ssh
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