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Saint Louis Unix Users Group

The Saint Louis Unix Users Group (SLUUG) is an IRS 501c(6) designated not-for-profit professional association dedicated to education and communication among computer users. SLUUG members include many Linux and UNIX professionals, Networking experts, System experts, hobbyists, and students. Also, many who are interested in Unix, Unix-like Operating Systems, Linux, BSD and other Free Open Source Software (FOSS) applications, products, projects and services.

We have met continuously since we incorporated in July 1992. All of our meetings are free and open to the public. There is no individual membership fee.

Monthly Technical Presentations

Connection instructions will first be sent to our mailing lists and then linked here .

We will open the remote session at about 6:00 PM, Central Time, so that you can join early to test your microphone, screen sharing and video camera .

Then we start at 6:30 PM with our BASE introductory level session ( often focused on personal computing ); which may include either amazing graphical packages, blinking lights, command line wonders, demonstrations of useful applications, displays of newly discovered web sites, major resolution of long standing anomalies, quantum discoveries, smoke and mirrors, superb tutorials, or shifts in both time and space.

Sometime after 7:00 PM we attempt a quick welcome, introductions, announcements, current events of interest, and a general CALL FOR HELP (Questions and Answers) segment.

Sometime after 7:15 PM, we may take a short break before our MAIN topic ( often focused on enterprise computing ),


  • Online Sessions only.
  • NO PHYSICAL MEETINGS until further notice.
  • These sessions will use ZOOM remote video service.


Wednesday, June 12th, 2024

From 6:30PM till 9:00PM Central Daylight Time (CDT) UTC-05:00

We will open the remote session at about 6:00 PM CDT, so that you can join early to test your microphone, screen and video sharing.

Next scheduled meeting dates


Something fundamental, introductory, instructive, short, simple or small.

BASE Topic: Network Sniffing ~ Part Two

Presenter: Grant Taylor and Lee Lammert

An adventure in starting network "sniffing". WireShark into TCPdump!

Just starting to "sniff" to see what is going on at that network interface? Last month we showed an overview of how to start and "get the feel". This month, lets look at some specifics. (This is a tutorial, so if it seems a bit esoteric, we expect folks to ask questions. We hope for a good discussion.)

Our mission tonite is to have Wireshark SSH to a system and run tcpdump remotely and send the packet data back to Wireshark on the client.

To do this, the client needs to be able to log into the remote system and gain sufficient privileges to run tcpdump without password prompts. There are a few different ways to do this. The simplest hack is to allow root to log in (with keys) and put the client's public key in /root/.ssh/authorized_keys so that the client can SSH directly to root and run tcpdump. A better solution would be to log in as a normal user and use something like sudo (without password prompt).

N.B. ( nota bene ) I use a local SSH agent to use an encrypted SSH key to both authenticate to the remote system and to sudo on the remote system.

client% ssh -T ${REMOTE} "/usr/bin/sudo /usr/sbin/tcpdump -U -s0 -w - not port ${SSH}" | wireshark -k -i -

Episode 2 of a series! You can see episode 1 (from May 8) in our archive at and look under Presentation Archives. for... SLUUG Basic: Network Sniffing for Beginners by Grant Taylor and Lee Lammert Slides Complete recording: Video, Sound, Captions, Chat. )

Something more advanced, detailed, important, new, profound, significant, timely or useful.

MAIN Topic: Social Media for Techies

Presenter: Scott Granneman

What we should know and Why should we care.

What "social media" might a nerd or techie want to use? Mastadon? Slack? Discord? TechTV? ??? What are the diffs between these and other social media? Why use one rather than another?

Normally either an Abstract/Background/Details/History/Outline/Summary/Walk-through will be listed when available.

Possible Future Topics

Other independent, loosely affiliated SLUUG sponsored Special Interest Groups:

Click here if you do not see past presentations listing

Contact SLUUG if you have a presentation you would like to have considered for selection.

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