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  • Preventing resolv.conf From Being Automatically Overwritten with Each Restart or network restart
    03/12/2013 4:56PM

    I am running CentoOS 6.3 and have set up a local nameserver.  As a result, I've customized my version of /etc/resolv.conf to include both the IP of my local nameserver as well as a domain and search configuration directives.

    When I restarted the machine, or if I restarted networking resolv.conf was overwritten.

    It turns out that the contents of the ifcfg-ethN files determine how the network scripts behave and how, or if resolv.conf is modified programatically.

    To prevent this make sure NOT to include a DNS1 (or 2, etc) entry in your ifcfg file and make sure TO include a PEERDNS=no entry.

  • Tabbing To Links Problems in Browsers under Mac OS X
    02/05/2013 3:43PM

    I am working on building some 508 Compliant/Accessible web sites and am testing out how well the navigation works using only the tab key.

    Under Mac OS X with Firefox, Opera, and Safari, by default, the tab key does not cycle through all of the links on a web page.


    • Go to: System Preferences/Keyboard/Keyboard Shortcuts
    • Click on the 'All controls' radio button towards the bottom of the dialog under the text that says: 'Full Keyboard Access: In windows and dialogs, press Tab to move keyboard focus between:'


    • Enabling the aforementioned setting does not do it for Safari
    • Go to: Safari/Preferences/Advanced
    • Under 'Accessibility:' click on the checkbox next to 'Press Tab to highlight each item on a a wepage'


    • Go to: Opera/Preferences/Advanced
    • Click on 'Shortcuts' in the left-hand nav of the dialog
    • Select 'Enable single-key shortcuts'
    • Opera does not implement keyboard navigation the way most other browsers do.  To step through the links on a page, press the 'Q' key to go forward, and 'A' key to step backwards through the links on the page.  'W' and 'S' keys you to navigate between headings <hn> tags.


    • Go to: Chrome/Preferences
    • Scroll all of the way down to the bottom of the settings page and click on 'Show Advanced Settings'
    • Scroll down to 'Web Content'
    • Check the box next to 'Pressing Tab on a webpage highlights links, as well as form fields'
  • Allowing Popups in FireFox from Locally Sourced Files
    02/05/2013 11:37AM

    If you want to allow a popup from a file accessed via file:///home/rchapin/some_dir/somefile.html, open FireFox's Preferences, click on the Content tab, and click on the 'Exceptions' button adjacent to the 'Block pop-up windows' check box.

    Then enter '<file>' in the 'Address of website:' field and click the 'Allow' button.

  • How to Add an Application to the Mac Approved Software List
    02/04/2013 9:16AM

    I am installing Eclipse on Mac OS X Mountain Lion.  Unpacking the .tar.gz was no problem, however, when I went to run it for the first time I got the following error message:

    Your security preferences allow installation of only apps from the Mac App Store and identified developers

    To add Eclipse to the list of 'approved' applications run the following command in a terminal:

    xattr -d com.apple.quarantine /path/to/Eclipse.app
  • Websites about Programming by Programmers
    01/22/2013 5:52AM
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