Yearly Archives: 2012

scientia potentia est

What most people are objecting to is that the market gives people what the people want instead of what the person talking thinks the people aught to want.
–Milton Friedman

Milton Friedman is easily the most influential economist since John Maynard Keynes. What makes him such a powerful voice for the free market is his ability to distill complex macro economic theory into chunks non-economists can easily understand.  He is so influential, and understandable, that PBS actually produced a series with him explaining economic ideas and debating these thoughts with other prominent scholars, politicians, and businessmen. The series was called “Free To Choose.”

Unfortunately most of us don’t have hours worth of time to watch all the episodes (although you should.)  To get a quick overview of each of his core concepts Trent Liberty has produced a series of 7 videos called The Friedman Series.  The background audio ranges from amazing to annoying, but the topic selection is outstanding.  If you get nothing else from the video, always remember that the biggest danger to liberty isn’t inequality, but the sincerity of the well intentioned.

To Any Place Worth Going

One of the best parts of Unix systems is that fundamentally they are built as development platforms.  The most common text command interface for Unix is call Bash (the Bourne Again Shell)and it is a full blown script-able interface allowing direct interaction with command line programs and giving the user the ability to string together these programs into really powerful applications.  Because of the power of this interface, developers have over many years improved the ability to use it directly as well.  Things like <tab> completion are well known, but how about reverse command searches, built-in text editor mode, and shortcuts galore.  I have been trying to use more and more of this “built-in” bash functionality and so below are some of my favorite shortcuts and functionality.

Shortcuts:

Ctrl + A Go to the beginning of the line you are currently typing on
Ctrl + E Go to the end of the line you are currently typing on
Ctrl + L Clears the Screen, similar to the clear command
Ctrl + U Clears the line before the cursor position. If you are at the end of the line, clears the entire line.  Especially useful when you know you’ve mis-typed a password and want to start again.
Ctrl + K Cut the line after the cursor, inverse of the Ctrl + U
Ctrl + Y Pastes the content from a previous Ctrl + K or Ctrl + U cut.
Ctrl + H Same as backspace
Ctrl + R Search through previously used commands
Ctrl + C Sends SIGINT to whatever you are running (effectively terminating the program.)
Ctrl + D Exit the current shell
Ctrl + Z Puts whatever you are running into a suspended background process. fg restores it.
Ctrl + W Delete the word before the cursor
Ctrl + T Swap the last two characters before the cursor
Alt + T Swap the last two words before the cursor
Alt + F Move cursor forward one word on the current line
Alt + B Move cursor backward one word on the current line
Tab Auto-complete files and folder names (f there is a multiple option match hitting Tab twice will list all possible values.)
Alt + . Paste the previous commands final argument (great for running different commands on the same file path.)

To see a complete list of all bound bash shortcuts you can type

bind -P |less

but you may need to look-up some bash hex character values to understand all of them.  What is more you can actually set bound shortcuts to almost anything you can think of, including actual applications, for example:

$ bind -x ‘”\C-e”‘:firefox.

will launch the Firefox web browser from the command line when you hit Ctrl + e.

Another one of my favorite commands is fc (fix command.) If you simply type

fc

FC will copy your most recent bash history into your preferred editor (vi by default on most systems) and allow you to edit it within the editor.  If you save and exit the editor it will automatically copy it the contents into the bash session and hit enter.  Additionally if you are interested in editing some other history item you can type

fc -l

to get a full history with numbers beside them.  Then type

fc <num>

where<num> is the history number you want to edit.  In a former life my bash terminal and fc was all I needed for most SQL testing.

A Person Wrapped up in Himself

Package building under RPM hasn’t actually changed a whole lot in the last decade.  While I have notes scattered around the website on building and maintaining package repositories; the one part that has changed significantly is the use of git for version control.  Thankfully tagging, archiving, and building packages is pretty simple under git basically consisting of the following three steps:

  • git tag -a 1.1 -m “Version 1.1″
  • git archive –prefix=projectname-1.1/ 1.1 |bzip2 > ~/Temp/projectname-1.1.tar.bz2
  • rpmbuild -tb ~/Temp/projectname-1.1.tar.bz2

The -a option will create a “true” package tag although it will not be signed with a digital key.  Of course the rpmbuild command depends on correctly formatted spec file in the base of your project directory.  Make sure the spec file version and changelog have the same version number as your tag.  FYI for scripting purposes it is good to remember that changelog dates use the following date command format:

date +’%a %b %d %Y’

The reason I mention scripting is because I am working at extending my automated build script for software packages I manage.  Way back in my days at DPS I had developed a bash configuration that would allow me to download, package, and build a piece of software directly from the CVS repository.

When I moved to Cobb Engineering I also changes version control software and started using SVN.  Extending my previous script to supportboth CVS and SVN wasn’t too hard.  Now I have a number of personal projects at home as well as software examples I keep for my students at ITT-Tech; all of which is stored/managed in Git.  The new software package script is almost done but I would really like to be able to update a spec file, changelog, tag, package, and build with one command.

The most useful part of my build script is that is doesn’t require me to spend any time remembering how to use it.  By default is has both auto-complete as well as logical default behaviors.  I just run buildpackage and it will list the available projects that I have ready to build.  If I run buildpackage project it will present me with a list of versions that have already been tagged.  One of these days I will post it publicly but I seriously doubt there is much interest in the broader community as almost everyone who develops at this level seems to already have their own custom build  scripts.

more than you can afford to lose

I honestly don’t know why some links seem more appropriate in a blog; as compared to my freakishly huge bookmark list.

  • Getting Started with NoSQL – I tell my students that much of the support development they do in the future will be on MySQL and much of the new development they do themselves will be with NoSQL.  Good into to CouchDB, my current favorite.
  • Fedora Packing Guidelines for cpanspec – I started writing a script like cpanspec almost 8 years ago, but never finished because the complexity of figuring out CPAN dependencies was taking too much time away from actual development.  This thing is an absolute MUST for Perl developers using RPM based systems.
  • Renaming a Git repository stored in gitolite – You know a technology is a game changer when it not only solves problems you have but solves problems you didn’t even realize were problems.  Git is like that and gitolite is how I manage my git repositories.  After having to do a Google search on this… twice, I figure I better save the link.
  • Moving files from one git repository to another while preserving history – Title says it all.  The only thing to add is that this post includes a link to Linus’ “greatest git merge ever” post, which was not only a cool post (if you a total nut-job computer geek) but started a pretty amazing thread about “cool” git merges.
  • Using git archive – I use something like  git archive –prefix=proname-1.1/ 1.1 |bzip2 > proname-1.1.tar.bz2 to create my deployment packages on Linux. This is a nice document listing examples and use cases for git archive.  This only works if 1.1 is a branch or has been tagged via something like git tag -a 1.1 -m ‘Message about tag.’
  • Telling Linux to ignore a bad part of memory – Is memtest freaking out about some bad memory?  How about simply telling the Linux kernel not to use that chuck?  This modifies the grub options so the Linux kernel knows which part of memory not to use before it actually loads itself up.

We have been betrayed by both

I know this is basically a rant but, there seems to be a fundamental disconnect between people’s understanding of economics and reality.

Just to be absolutely clear, undue political influence by corporations is directly related to the power, breadth, and size of the government they work to influence. This means that, by its very nature, the enlargement (and especially centralization) of government works as an agent for the expansion of corporate influence and NOT, as many progressives hope, a counterbalance to it.

Corporatism is a symptom of the problem, not the cause. Any regulatory attempt to alleviate the pain caused by that symptom only acts, ultimately, to aggravate the problem.  While attention and public outcry may temporarily hide the influence of business; capital never looses attention and will quickly take over when politics has moved on.

Before some conservatives start yelling hallelujah from the roof-tops, understand the implications of this.  The opposite of supporting government is NOT support business because being pro business is effectually the same as being pro government. Ultimately business will work to extend its competitive advantage at the cost of consumer independence and there is no better way to extend a business advantage than to legislate one.  Remember, every monopoly throughout history was created by an act of government legislated preference.

The only solution to corporatism and socialism is capitalism, a real free market.  The free market is not just the only way to limit government influence, but it is the only way to limit corporate influence as well.

What I have been Tweeting

  • I really really hope the #thunder win, but after this series I have nothing but respect for #spurs Respect! and thanks for the great series #
  • #Wisconsin #money it looks like Walker raised 5x as much hard money as Barrett; and Barrett benefited from 10x the amount of soft money. #
  • A year old, but I just saw it while looking up news on #Wisconsin "Wisconsin schools buck union to cut health costs" http://t.co/D6JqEGqh #
  • #OKC GO THUNDER!!! We did it… we did it.. we did it1!! #thunderup #
  • #NBA #thunder Gregg Popovich has got some class. Tuesday night is gonna be crazy #