Operating system is irrelevant here as it will need to be done at boot or outside from it, if you are talking about formatting the main hard drive.
I would recommend Darik's Boot and Nuke and use it on a USB drive, simply plop it in a machine and start, then move on to the next.
Alternatively, if you don't mind a bit of setup and these machines are networked, you can look at deploying Boot and Nuke to a PXE server and use TFTPD32 on Windows or any PXE server on Linux then you will be able to launch Dban across the network - just be careful that this is separated or other machines are not able to boot from it!
Short answer: you can't. Ports below 1024 can be opened only by root. As per comment - well, you can, using CAP_NET_BIND_SERVICE, but that approach, applied to java bin will make any java program to be run with this setting, which is undesirable, if not a security risk.
The long answer: you can redirect connections on port 80 to some other port you can open as normal user.
Run as root:
# iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
As loopback devices (like localhost) do not use the prerouting rules, if you need to use localhost, etc., add this rule as well (thanks @Francesco):
# iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j REDIRECT --to-ports 8080
NOTE: The above solution is not well suited for multi-user systems, as any user can open port 8080 (or any other high port you decide to use), thus intercepting the traffic. (Credits to CesarB).
EDIT: as per comment question - to delete the above rule:
# iptables -t nat --line-numbers -n -L
This will output something like:
Chain PREROUTING (policy ACCEPT)
num target prot opt source destination
1 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080 redir ports 8088
2 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 8080
The rule you are interested in is nr. 2, so to delete it:
# iptables -t nat -D PREROUTING 2
Best Answer
Set your locale date environment variable
LC_TIME
to "en_DK" Set it in your.bashrc
or similar, or checkman locale
for how to set it system-wide.On ArchLinux all of the Locale settings are in
/etc/rc.conf
and customisations are set up in/etc/rc.local