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---
format: rst
toc: no
...

=======================================
Miscellaneous Software Stuff
=======================================

Log Analysis
---------------
http://logstash.net/

Regular Expressions
---------------------
http://code.google.com/p/semicomplete/wiki/GrokDiscovery

http://txt2re.com/

Compression for Executables
---------------------------

UPX: Ultimate Packer for Executables http://upx.sourceforge.net/

Webmail
-------

the null webmail client http://www.nulllogic.ca/webmail/


Standard ML
-----------

`The SML Standard Basis (of types)
<http://www.soc.napier.ac.uk/~andrew/SMLBasis/sml-std-basis.html>`_

Mutually recursive function using 'and' syntax:

    fun foo 0 = "beer car"
    |   foo n = bar(n-1)
    and bar 0 = "bacon"
    |   bar n = foo(n-1);

Network programming in SML/NJ: https://github.com/tonyg/smlnj-networking/


plan9 and Inferno
--------------------

"Styx-on-a-Brick": networked LEGO device
http://doc.cat-v.org/inferno/4th_edition/styx-on-a-brick/

plan9 on a GuruPlug
http://plan9.bell-labs.com/wiki/plan9/guruplug/index.html

NoSQL
------

NoSQL Data Modeling Techniques
http://highlyscalable.wordpress.com/2012/03/01/nosql-data-modeling-techniques/

PHP Problems
--------------

[PHP: A fractal of bad design](http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/)

[PHP Sucks but it doesn't matter](http://www.codinghorror.com/blog/2008/05/php-sucks-but-it-doesnt-matter.html)

LISP Visualization
------------------
Nested boxes instead of nested parens: http://pretty-lisp.org/

Webmail
-------

Squirrel mail is ok, CiderWebmail looks better. Have had problems deploying
Alpine Webmail.

Structured Wikis
----------------

Circa May 2012 there are a few options for structured data in wikis:

*[Semantic MediaWiki](https://en.wikipedia.org/wiki/Semantic_MediaWiki)* is
probably the best option, though it is unfortunately in PHP. This is a series
of plugins/extensions to vanilla MediaWiki, which add editing (with or without
forms), querying, visualization, import/export, etc.

*MediaWiki with the [WikiDB](http://www.mediawiki.org/wiki/Extension:WikiDB)*
(PHP)

*DokuWiki with [data plugin](http://www.dokuwiki.org/plugin:data)* (PHP)

*eLog* could be used to collaboratively edit simple data.

*TWiki* has structured data features and an input form (Perl). 

DBPedia uses [custom extraction
tools](http://wiki.dbpedia.org/Documentation?v=6hz) for MediaWiki written in
Scala. dbpedialite uses just calls the Wikipedia API (Ruby).

You can [search](http://www.wikimatrix.org/search.php?sid=54395) wikimatrix for
wiki engines which have a "structured data" feature.

Semantic Data Publishing
------------------------

[OntoWiki](http://ontowiki.net/Projects/OntoWiki/Features)

[Google Refine](https://en.wikipedia.org/wiki/Google_Refine) (formerly known as
Freebase Gridworks) seems pretty useful for "cleaning up" datasets. It's a Java
"workstation" app with a web/http interface. 

USB Performance Issues
----------------------

Parallelized mass storage transfers are much slower than serialized:
http://blog.dinkevich.com/why-usb-transfers-are-slow/

Inkscape Black Rectangle Box Issue
-------------------------------------
For some reason Inkscape sometimes inserts a black box into .svg files which
are invisible within Inkscape but visible when exported.

To remove this box, edit the raw XML using the XML Editor in Inkscape
(Shift-Ctrl-X), look for an svg:flowRoot element within the first layer, and
delete it.

Latency Numbers
-----------------

From https://gist.github.com/2841832::

    L1 cache reference                            0.5 ns
    Branch mispredict                             5   ns
    L2 cache reference                            7   ns             14x L1 cache
    Mutex lock/unlock                            25   ns
    Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
    Compress 1K bytes with Zippy              3,000   ns
    Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
    Read 4K randomly from SSD*              150,000   ns    0.15 ms
    Read 1 MB sequentially from memory      250,000   ns    0.25 ms
    Round trip within same datacenter       500,000   ns    0.5  ms
    Read 1 MB sequentially from SSD*      1,000,000   ns    1    ms  4X memory
    Disk seek                            10,000,000   ns   10    ms  20x datacenter roundtrip
    Read 1 MB sequentially from disk     20,000,000   ns   20    ms  80x memory, 20X SSD
    Send packet CA->Netherlands->CA     150,000,000   ns  150    ms

    Notes:
    1 ns = 10-9 seconds
    1 ms = 10-3 seconds
    * Assuming ~1GB/sec SSD

Great Hacks
----------------

HTML as image: http://lcamtuf.coredump.cx/squirrel/

xscreensaver
-------------
To lock the screen immediately, do:

    xscreensaver-command -lock

Lua Tools
-------------

http://haserl.sourceforge.net/ "Dynamic web content in 20K"

Semantic Wiki Setup Notes
---------------------------

There is a [](Semantic MediaWiki quick reference), as well as good
documentation of the
[http://www.mediawiki.org/wiki/Extension:Semantic_Forms/Quick_start_guide](Semantic
Forms) plugin.

[http://www.mediawiki.org/wiki/Extension:External_Data](External Data) plugin
allows remote import of data via HTTP API call (cached) or file upload (eg,
XML, csv).

"The djb Way"
--------------
[Dan Bernstein](http://cr.yp.to/djb.html) writes a lot of network daemons in a
unique style. Eg, daemontools, ucspi-tcp, djbdns, qmail, and publicfile.

- [The djb way](http://thedjbway.b0llix.net/readme.html)

How TTYs Work
----------------

<http://www.linusakesson.net/programming/tty/>

Covers ``nohup``, piping, process groups, session leaders, TTYs, PTYs,
``stty``, etc.

Web Security
-----------------
<http://stackoverflow.com/questions/549/the-definitive-guide-to-forms-based-website-authentication>

<http://code.google.com/edu/security/index.html>

<https://www.owasp.org/index.php/Main_Page>

Capture all HTTP Traffic to File
----------------------------------
Install ``tcpflow`` and do:

    $ mkdir ~/full_dump; cd ~/full_dump
    $ sudo tcpflow -i wlan0 -b 2097152 tcp port 80 or tcp port 443

Saves up to 2MB 

wget
--------
For recursive, I usually want something like:

    wget -r -l 3 <baseurl>

To just get files, ignoring structure:

    wget -r -l 3 -nd <baseurl>

QEMU with chroot
-------------------
Manual way:

    $ sudo chroot ./rootfs-dir/ qemu-arm-static /usr/bin/env

The automatic way is to copy the host's qemu-arm-static to usr/bin in the
chroot, then just run the command and qemu-arm-static will be used
automagically:

    $ sudo chroot ./rootfs-dir/ /usr/bin/env

Starting an SSL CA
----------------------
"[cryptography] How much does it cost to start a root CA ?"
Jon Callas <jon at callas.org>, Sat Jan 5 14:42:31 EST 2013
http://lists.randombit.net/pipermail/cryptography/2013-January/003601.html

Answer: $250k over 14 months, 40% hardware, 60% people