Tail is a very import part of linux administrative tools. Apart from using it with a combination of script to achieve day to day goals “tail” can be used by itsef for some important administrative tasks. Observing live log files is one of those tasks. Tail by default only shows the last 10 lines of [...]

It is a packet sniffer which runs as a background process and serves its statistics to a web browser:
- input and output IP traffic by machines, ports and protocols,
- last minute, hourly, daily and monthly global input and output graphics.
It is known to be smaller (in terms of memory footprint) and stabler than ntop.

 
Darkstat website: [...]

Perhaps one of the most important network monitoring tool in linux out there ngrep strives to provide most of GNU grep’s common features, applying them to the network layer. ngrep is a pcap-aware tool that will allow you to specify extended regular or hexadecimal expressions to match against data payloads of packets. It recognizes IPv4/6, [...]

So you’ve had a compromise and need to figure out which files (if any) were modified by the intruder, but you didn’t install Tripwire? Well, all is not lost if your distribution uses RPM for its package management system. While not as powerful as Tripwire, RPM can be useful for finding to what degree a [...]