I personally prefer Debian GNU/Linux or Ubuntu GNU/Linux as operating systems. All my servers and workstations and even my notebook runs Debian GNU/Linux or Ubuntu GNU/Linux. I really like it, because it's a free OS with many easily installable packages.
Some links:
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SSH over HTTPS
How to make a SSH-Connection when only HTTPS is available
HOWTO by Alexander Krogloth
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Ubuntu Linux on a Dell Latitude D630
Some tricks for Ubuntu on Dell Latitudes
HOWTO by Alexander Krogloth
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ISDN with a passiv card on Debian Tutorial
ISDN with a passive card and Capisuite on Debian GNU/Linux (old)
HOWTO by Alexander Krogloth
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RRDTool on Debian GNU/Linux Tutorial
RRDTool on Debian GNU/Linux Tutorial - HOWTO by Alexander Krogloth
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Linux Iptables Firewall with a Webinterface Tutorial
Using your firewall to turn on/off the internet connection of specific clients - HOWTO by Alexander Krogloth
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FAQ
Some Unix/Linux FAQ
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xorg.conf
Xorg config for Dualhead with ATI Radeon 9600 on Debian
Some scripts:
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mp3 rename script
A script which renames .mp3 files
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rotate script
Rotates foo.jpg and foo_thumb.jpg
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thumbnails script
Creates thumbnails for all photos in the specified directory
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watermark script
Watermarks all photos in the specified directory