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Posts Tagged ‘linux’
openssl for netcat use

If you ever have a need for a pipe to netcat, you might want to want to enhance your connection with encryption, here is a short example running the connection with openssl, instead of netcat. openssl s_server -cert /etc/ssl/server.crt -key /etc/ssl/private/server.pem yeah, that’s right, you need a certificate. I reused the one of my webserver. [...]

symfony deployment check list

when you deploy a symfony application, especially if it isn’t yours, I need a check list, otherwise I tend to forget things. This one helped me: it is from 2010, but still helps, since apps don’t get younger without a deployment. After deployment, I run further checks, similar to the ones written down here: [...]

desktop streaming

Finally I come around to publish an 3.5y old draft. On 20120130 (iso style date), I was closing a project where I needed streaming a (Linux/X11) desktop to (Digital) TVs. So I wanted to flush out my notes to this blog, but never did, until today. You still need to tell the TV to watch [...]

mpeg-dash with ffmpeg for HbbTV delivery … (UHD included!)

When looking (reading) around for other HbbTV projects, I found this blog which has a quick walk through in content conversion for HbbTV. Since this is a quick write up for complete coverage of their destination formats, including the command lines, I post it here, as a cheat sheet, in case your ffmpeg blows up [...]

error handling in bash

another post I found about bash, and how to write shell code that lives for decades, this time for good (and not the horrible nightmare that hounds you down 15 years later). Before following the link, please note that the code example explained therein created some controversy about writing style, capitalizations, and POSIX sh compliance: [...]

parallelism (not really) in bash

while researching about at/atq under linux, I came across this interesting piece of example code, how to run shell processing of files (or file based jobs) in parallel, using bash and makefiles. check it out here

finally a example of XRandR

A mailing-list post named “XRandR transform (keystone correction) ….” is finally the rosetta stone to understand XRandR. the important part (thanks to Glynn Clements for this): First, the transformation converts from output coordinates to input coordinates. So the above will result in the bottom corners of the screen being mapped 100 pixels in from [...]

meet the OSPF admin from Hell, or better blackhole networks (OAFH/OAFBN)

I found this post amusing and educating at the same time. Overloading the OSPF LSDB Long story short, this admin takes his lab setup for a ride to 500k routes in OSPF and BGP, to see how a full BGP table would fit on this rather old test devices (and when and how they would [...]

compress pdf on the command line

This is a quick note to myself … when I have to compress PDFs again (e.g. to send out CVs), this command made my day … and the PDF from 2.6 MB to 77KB! gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=~/compressed.pdf ~/fromprinterdriver.pdf I found it on the address below … there is also an [...]

Imagemagick ….magic scripts (err formula)

Go to and experience a new level of imagemagick, with Fred’s magic formula. He has scripts for the different usage cases of imagemagick. Of course you need imagemagick, but this on every platform, is another story.

bash (shell) revisited ….

SystemV Init (Wikipedia) is on the decline, thanks to systemd which is adopted at mach speed compared to other architectural changes in the linux world. But shell scripting has its place, especially as it can work as a glue layer between lots of other software, and a lot of daemons still expect to call shell [...]

Mac OS X Server like AD for SSO

If you are using a lot of Macs in your lab, or you are planning to do so, you might be interested to know that there is a single-sign-on solution for Mac OS X, that works about as easy as Windows Domain Controllers for that purpose. Of course Macs play nice with a Windows Server, [...]

Linux Bonding … an Introduction

If you ever thought about having more than one ethernet link in action on your linux server or pc, you should have a chance to learn more about the inner working of that, to fully use all that available bandwidth or protection. Here is a link to get further reading about the available modes, bonding [...]

A tool to visualize disk space

In case you have asked yourself the question, where has all my disk space gone? This little programmes can give you an answer, by visualizing your hard disk usage. Little files and folders are small, others are bigger. I guess there are Windows Programmes as well, but then you might not read here. All others [...]

updates erledigt.

Falls Euch der Ausfall am Samstag zwischen 16-22h aufgefallen ist, ich habe nur das Betriebssystem von diesem Server auf die aktuellste Ausgabe aktualisiert. Damit haben wir jetzt wieder über 500 Tage automatische Updates.