Sunday, November 14, 2010

Kernel API Changes log at

Linux I/O ports

Linux Kernel Development Overview Google Tech Talk - Greg KH

...and why you should care :)


Linux Kernel - Wikipedia

Pragmatic Programmer's Quick Reference (Coding Horror)

Emacs WikiMode

Email Apnoea - Linda Stone (Huffington Post)

I notice I am also doing this when waiting for the computer to do anything ... load a webpage, compile something, do a grep or find on large sets, ... how about you?

Wednesday, November 10, 2010

Stepper Motor Specs

Superior Electric
Synchronous / Stepping Motor

18 oz-in
200 steps per rev
24.0V 0.18A DC
SPEC 2462606/05
65degC rise
The Superior Electric Company Bristol CT USA

Measured Black (common) to phases ~125ohm DC cold (~18degC?)

Phases unknown sequence at this stage
Red Blue Yellow Orange

JeeNode Experimenters Pack

Arduino-ish with an RF transceiver on ISM band(s) - nice

Wordpress Blog Software - free

In Praise of Quitting Your Job

Apple Battery Charger -- n0mn0mn0m :)

Proxy Auto Config (PAC) Files (Calomel)

Squid Ad Blocker howto (Calomel)

Squid Ad Blocker howto (Calomel)

Calomel Open Source Research and Reference

Rate Monotonic scheduling Algorithm analysis (Linden Tree UK)

Tuesday, November 9, 2010

Reverse tunneling SSH ... manual extract

-L [bind_address:]port:host:hostport
Specifies that the given port on the local (client) host is to be
forwarded to the given host and port on the remote side. This
works by allocating a socket to listen to port on the local side,
optionally bound to the specified bind_address. Whenever a con‐
nection is made to this port, the connection is forwarded over
the secure channel, and a connection is made to host port
hostport from the remote machine. Port forwardings can also be
specified in the configuration file. IPv6 addresses can be spec‐
ified with an alternative syntax:
[bind_address/]port/host/hostport or by enclosing the address in
square brackets. Only the superuser can forward privileged
ports. By default, the local port is bound in accordance with
the GatewayPorts setting. However, an explicit bind_address may
be used to bind the connection to a specific address. The
bind_address of “localhost” indicates that the listening port be
bound for local use only, while an empty address or ‘*’ indicates
that the port should be available from all interfaces.

Wednesday, November 3, 2010

ssh-copy-id copying ssh id (public key) to another host

From :

$ ssh-copy-id myhost
...enter password...

...and that's it

Handy, eh?

Sherlock Holmes on Knowledge

Sherlock Holmes closed his eyes and placed his elbows upon the arms of his chair, with his finger-tips together. “The ideal reasoner,” he remarked, “would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it. As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after. We have not yet grasped the results which the reason alone can attain to. Problems may be solved in the study which have baffled all those who have sought a solution by the aid of their senses. To carry the art, however, to its highest pitch, it is necessary that the reasoner should be able to utilise all the facts which have come to his knowledge; and this in itself implies, as you will readily see, a possession of all knowledge, which, even in these days of free education and encyclopaedias, is a somewhat rare accomplishment. It is not so impossible, however, that a man should possess all knowledge which is likely to be useful to him in his work, and this I have endeavoured in my case to do. If I remember rightly, you on one occasion, in the early days of our friendship, defined my limits in a very precise fashion.”
“Yes,” I answered, laughing. “It was a singular document. Philosophy, astronomy, and politics were marked at zero, I remember. Botany variable, geology profound as regards the mud-stains from any region within fifty miles of town, chemistry eccentric, anatomy unsystematic, sensational literature and crime records unique, violin-player, boxer, swordsman, lawyer, and self-poisoner by cocaine and tobacco. Those, I think, were the main points of my analysis.”
Holmes grinned at the last item. “Well,” he said, “I say now, as I said then, that a man should keep his little brain-attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library, where he can get it if he wants it. Now, for such a case as the one which has been submitted to us to-night, we need certainly to muster all our resources. Kindly hand me down the letter K of the American Encyclopaedia which stands upon the shelf beside you. Thank you. Now let us consider the situation and see what may be deduced from it.

Excerpt from 'The Five Orange Pips'... partial quote in Pro Git book piqued my interest. Will read the book @ some stage ... it's PD and available on Project Gutenberg


Mobile / VoIP themes - and Git! :)

Git Quick Reference online - Scott Chacon

By Scott Chacon - the same author as the Pro Git (Apress pub.) book

Looks very handy