Virtualization with Virtualbox This is how I install Virtualbox on Fedora 9

System emulation with QEMU QEMU is an open source emulator for complete PC systems. In addition to emulating a processor, QEMU permits emulation of all necessary subsystems, such as networking and video hardware.

MPlayer Installation from Source MPlayer a movie player for Linux. Supports reading from network, dvd, vcd, file, pipes, and v4l. The recommended way to install MPlayer is to compile from source.

ccomp.sh file(s) compresses script compresses the file given as the first argument as best as it can, whichever compression method (gzip/bzip2) works better on the file will be kept. (contributed by Hikaru)

Iptables Tutorial Oskar Andreasson iptables tutorial v. 1.2.0 in .pdf format (note: new version of this tutorial 1.2.2 is out).

Oskar Andreasson is back with new version of iptables tutorial 1.2.2, All versions are as usual available at: http://iptables-tutorial.frozentux.net

Here are few scripts that could help slackware users to create slackware packages (.tgz) from sources.

slackconfig cp the script to /usr/local/bin (dont' forget to chmod +x it). After untarring the package source cd to the directory and type "slackconfig" instead of typing "./configure"

slackmake cp the script to /usr/local/bin (dont' forget to chmod +x it). Type "slackmake" as root instead of typing "make"

SpamControl patch for qmail The excellent SPAMCONTROL is an add-on (patch) for qmail-smtpd to filter and control unsolicited commercial E-Mails (UCE/SPAM) by means of the available (E)SMTP session protocol elements. In addition, it allows a state-of-the-art wire-speed filtering of the messages' content and more.

vnStat From the author: "vnStat is a network traffic monitor for Linux that keeps a log of daily network traffic for the selected interface(s). vnStat isn't a packet sniffer. The traffic information is analyzed from the /proc -filesystem, so vnStat can be used without root permissions. However at least a 2.2.x kernel is required"

Download: Source

Slackware (tgz): Package
After installing the vnstat on slackware "installpkg vnstat-1.4-i486-1sbt.tgz" (if you are installing from source then do read the INSTALL), run ..
# vnstat --testkernel (to test your linux kernel is supported)

If you got error.. Unable to open database directory "/var/lib/vnstat".
Make sure it exists and is read enabled for this user.

Then create the vnstat directory "mkdir /var/lib/vnstat"

# vnstat -u -i eth0 (this will creates a file /var/lib/vnstat/eth0)
# cat /etc/cron.d/vnstat (and paste the line from this file in the bottom of crontab -e)
My crontab entry for vnstat looks like ...

# For vnstat, a traffic monitor
0-55/5 * * * * if [ -x /usr/bin/vnstat ] && [ `ls /var/lib/vnstat/ | wc -l` -ge 1 ]; then /usr/bin/vnstat -u; fi

Note: You can safely delete "rm -r /etc/cron.d".
Wait for 5 minutes and then run "vnstat -d" to start monitoring traffic on eth0 inteface.
vnstat --help (for other useful switches)