Saturday, February 06, 2016

Secure Shell

If you SSH into the command line in your server, or SFTP into your server, or use github, you'll need a SSH key. On your Mac, type cd~/.ssh and you'll be taken to the hidden ssh directory. Hidden files receive a period in the front. A directory listing (ls) will give you the private and public keys, id_rsa and id_rsa.pub. If you already have these keys, you can write over them for the sake of this exercise. First copy both keys in backup files.

Then let's run the keygen command from the terminal: ssh-keygen -t rsa -C "myblog@gmail.com"

which will generate a new set of keys. One of the parameters "rsa" is a type of encryption scheme. ls -l will show the new and the old backup keys.

To add the new key to the ssh-agent: ssh-add id_rsa

Do a "cat id_rsa.pub" and copy the contents of your public key. Then go to your github account, and under Profile, find "Settings" and choose "SSH keys" from the left pane. Add "New Key" then test your new key by doing a pull to make sure everything still works with github. You'll also be copying the new public key over to your server.

To connect to github.com over SSH and test your new key:

$ssh -T git@github.com

If you receive a message telling you that you have successfully authenticated, then all is well.

Chrome Debugging from JSFiddle

I didn't know you could do this. I just learned about it. Bring up the Developer Tools either by pressing Command, Option and J together or choosing View > Developer > Developer Tools. Stay at "Sources", and expand fiddle.jshell.net in the left pane. Choose index which will show you your code.

httpd.exe

is short for HTTP Daemon processes. If you are having port issues with Apache, terminate all the httpd.exe processes. Apache starts up multiple processes because it is expecting to handle multiple incoming requests and hand off the requests to different child processes for faster performance. If you kill off one of the child processes, the httpd parent process will automatically restart the child once it detects that the child is dead. None of this sounds good but that's the terminology and there's even a "daemon" in there. So to kill httpd successfully you have to kill the parent first.

git

To see if Git is installed on your computer: $git

If you don't have git, to install it: http://git-scm.com/downloads

To find out which version of Git that you have: $git --version

"which" tells you where the command is located on the disk so it gives you the path to it. It will only work on executables. To find out where Git is installed: $which git

There's one file called .gitconfig in the home directory with global git settings. To setup username and email key to associate with your commits:
$git config --global user.name "Josephine March"

To make your Git color coded: $git config --global color.ui true

If you change your permissions, git will ignore it if you run this command:
$git config --global core.filemode

Telling git to use nano as your CL text editor. This is very helpful with merges.
$git config --global core.editor nano

To see all the configurations:
$git config --list

To add a single untracked file into the repository:
$git add {filename}

To add all untracked files into the repository:
$git add .
$git add --all

To show what changes have been made:
$git diff

To show what changes have been made in a single file:
$git diff {filename}

Adding a file is staging. If you want to undo a stage:
$git reset HEAD {filename}

If you make changes in a file that's in a git repository and you have not yet staged them, you can reverse the changes with this command:
$git checkout {filename}

Github.com, place to store git repositories

Wednesday, February 03, 2016

d r w x r - x r - x Miné Jan 31 22:00

First slot: Is it a file or directory? Next set of triple slots is for the User, then the next three is for the Group and finally the last 3 spots is for Everyone. File permissions can also be represented using octal notation. r is 4(2^2), w is 2(2^1), and x is 1(2^0). So if it's readable, writeable and executable, it means it's a 7. If a file or directory is readable and executable but not writeable then that's a 5. You can convert between symbolic and octal representation using this tool.

Friday, December 18, 2015

Haas Neue Grotesk


Do you know what Crate & Barrel, Lufthansa, Energizer, SAAB, North Face, American Airlines, Urban Outfitters, NASA, Fendi, Staples and IRS Tax Forms have in common?

Friday, December 11, 2015

BNF Notation For Syntax

BNF or Backus Normal Form is a computer science notation technique that's useful in describing the syntax of a language. This Wikipedia article is an easy example that shows how it works:

Monday, July 20, 2015

How To Disable Text Area Resize

Resizable text areas are good as long as when you extend them, they don't "break" your page
visually.

Tuesday, July 07, 2015

Data Security

There's a new report by leading computer scientists on encrypted communication.

Sunday, June 28, 2015

Testing Mobile with Google Chrome

You can view sites as they would appear on a mobile device from your desktop browser. There is a hamburger menu on the right that lets you customize and control Chrome. From that menu, choose More Tools > Developer Tools.

Monday, June 15, 2015

Firebug to the Rescue

Firebug to the Rescue
So I'm looking at a weather report online and next to the temperature I get this wiggly sign that's supposed to tell me something more about the day.

Tuesday, May 26, 2015

How to Hang a Picture

Never one good with a level, two by fours, and hanging, I consider myself successful if a picture is not noticeably crooked. But if you wanted to do it perfectly, the experts have figured out the science behind hanging pictures:


© cssbakery.com

The rule of thumb is to hang your picture at anywhere between 56” and 60” on center. For 57 inches, "on center” means that the middle of the picture is always 57” from the floor.

Measuring from the floor, mark 57” on the wall. Measure the height of your picture and divide by two. This is your center. Measure the top of your picture to its tightened wire, tw.

Subtract tw from ½ the picture’s height. This number will tell you how far above your initial 57” mark you should place your hook.

Example: A 20” tall photo with a tight wire located 2” below
the top should have a hook placed at 8” above the mark. 10” – 2” = 8”; the hook should be placed 65” off the floor.

Kelly Phillips Badal


* This post was made using a blockquote class from a previous CSS post.

Sunday, March 01, 2015

Half Billion Dollar Art Heist Still a Mystery

Isabella Stewart Gardner Museum in Boston was the setting for the crime committed 25 years ago.

Sunday, November 16, 2014

Into Winter

Beech Forest
Image by Susulyka CC BY-SA via Wikimedia Commons
Beech Forest in Mátra

Saturday, September 27, 2014

Image Captioning Tool Enhancements


There's a new version of the Image Captioning Tool, my jQuery plug-in. I've added capabilities to truncate a larger image and also play an MP3 audio when the user hovers over an image. Move your mouse over the example image above to see how it works. To try it out on one of your images, see the Captioning Tool. Music by Coldplay.

Thursday, September 04, 2014

Basic CSS Drop Cap

Alorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus ornare velit sed libero tristique, ut pellentesque quam porta. Proin iaculis posuere aliquam. Aenean semper vulputate nisl et ornare. In adipiscing pretium ante vestibulum faucibus. Cras molestie, urna vel dignissim sollicitudin, mauris nisl condimentum leo, sit amet hendrerit nisi magna ut lorem. Sed ac porta augue. Sed feugiat odio at auctor venenatis. Donec eu scelerisque neque. Nulla facilisi.

Friday, August 29, 2014

Javascript Apply

In Javascript, everything is an object. So, unlike Java and C++, Javascript functions are also objects which come with some built-in methods that you can call. One of the methods is apply which lets you call the function and explicitly pass the value of the "this" parameter as well as the arguments to the function as an array.

Sunday, August 24, 2014

CSS3 Keyframes & Animation Property


Start/Stop

Monday, July 28, 2014

A New Search Engine: DuckDuckGo

Did you know that Google takes you on a quick detour every time you click on a search result? So Google knows not only what you searched on, but where you went with that search which is all stored indefinitely in a database on their servers.

Tuesday, July 22, 2014

Rotating Text & Making Columns with CSS3

Thursday, July 17, 2014

Encrypting Email

Here's a few options to help you encrypt your email.

Friday, July 11, 2014

Flat Design

Is less more in web design? Decide for yourself after seeing this flat design aesthetic discussion.

Thursday, July 10, 2014

Believing in an Open Internet

A New York Times video by Brian Knappenberger.

Tuesday, July 08, 2014

Setting up SSL on an Apache Server

I administer my own Apache2 server running on Ubuntu, and I had previously setup SSL using a self-signed certificate. Recently I needed to start using a certificate signed by a Certificate Authority to avoid the "untrusted site" browser warnings. In this post I outline the steps I went through to set it up.

Saturday, July 05, 2014

CSS Vendor Prefixes

When a new CSS property is being developed, and does not yet have a final, consistent implementation across browsers, you want to write it using vendor prefixes for each browser. That's a total of four statements with vendor prefixes followed by the official, unprefixed property for future use when the new property's implementation is completed.

To review the prefixes, we have: -webkit- for Google Chrome and Safari, -moz- for Firefox, -ms- for Internet Explorer and -o- for Opera. If you are unsure whether a CSS property needs a vendor prefix, there's a website which will answer that question for you.

Friday, June 27, 2014

CSS Drop Caps

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Sed tempus adipiscing eleifend. Aenean aliquam nibh quis enim varius cursus. Cras ut neque eget eros mattis volutpat. Nulla et pretium massa. Suspendisse potenti. Nam id quam mauris. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed sodales, leo dictum tempor auctor, nulla urna commodo lacus, eget vehicula nulla neque mollis velit. Quisque lobortis feugiat pharetra. Vivamus id nibh facilisis, dictum dolor quis, mattis tellus.

Tuesday, August 27, 2013

Data Security in Cloud Computing


Christian Science Monitor article discusses the impact of the government surveillance programs on the American cloud computing industry. A recent report estimates an average $30 Billion Dollar loss in the next three years for US based companies.

Related 2014 news: Internet Giants Erect Barriers to Spy Agencies | Germany Cancels Deal with Verizon | NSA and Your Phone | 2014 House Proposals

Sunday, August 18, 2013

Image Captioning Tool Enhancements

There's a new version of the Image Captioning Tool, my jQuery plug-in. I've added capabilities to truncate a larger image and also play an MP3 audio when the user hovers over an image.

Thursday, June 20, 2013

Elusive Beauty


Chasing Aphrodite documents the story of looted ancient artifacts that found their way to the Getty and the tenure of curator Marion True at the museum. Among other pieces, a million dollar, vine-like, delicate golden funerary wreath, and a $20 Million, 1,300 Ib statue of a woman in a flowing gown carved in limestone were returned to their source countries voluntarily by the Getty. Sharing the sepia image of the Getty Center by Michael Gäbler through Creative Commons.

Wednesday, March 13, 2013

Popular Programming Languages

A visualization for the most popular programming languages of 2012 on CodeEval.

Wednesday, December 12, 2012

Replacing CSS List Bullets with Images Using Sprites


  • To create a CSS list like this one, include the styles for numberedlist class and write your markup as shown in the blue box. You can switch to an ol from a ul if you think it'll help your code semantically
  • You can build your own sprite image in an image editor such as Adobe Photoshop or use this image which goes up to number 9
  • If you create your own image, compute the new offsets for the background-position property which is where the spriting is done
  • Good luck!   

Sunday, December 09, 2012

CSS Image Grid by Floating Different Sized Elements


Ansel Adams Wilderness

© Copyright by Steve Dunleavy | Creative Commons Share-Alike License 2.0
The picture shows a mountain range on the Pacific Crest Trail. This is a follow up to a question in a previous image grid post. In this post, I have the first image displaying larger than the rest. The only significant difference in the code between this and that earlier post is the CSS rule that allows the first image in the list to be larger (CSS selector: #grid li:first-child img). The same thing could have been accomplished by giving the first li an id and targeting that id with the CSS rule. e.g. id="big-image" and #big-image. The other modification was to change the widths and heights in the CSS to reflect the different image sizes I am using here. Your grid images will likely be self-descriptive and distinct. The reason I used cutups from a single image was for simplicity.