Jeff Barr - Horror/SciFi/Fantasy Pulp Fiction Writer, Coder, Hacker, Musician » Linux http://jeffbarr.com Schlock and awe. Sat, 21 Jan 2012 00:41:33 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Bash configuration notes http://jeffbarr.com/linux/bash-configuration-notes/ http://jeffbarr.com/linux/bash-configuration-notes/#comments Thu, 12 May 2011 19:44:13 +0000 Jeff http://jeffbarr.com/?p=152

vi .bashrc

is for current user only.

sudo vi /etc/bash.bashrc

is for all users – hence the sudo.

in .bashrc, add:

export PS1=”\e[0;34m[\u@\h \W]\$ \e[m”

to permanently change the bash prompt color.

List of Color codes:

  • Black 0;30
  • Blue 0;34
  • Green 0;32
  • Cyan 0;36
  • Red 0;31
  • Purple 0;35
  • Brown 0;33
  • Blue 0;34
  • Green 0;32
  • Cyan 0;36
  • Red 0;31
  • Purple 0;35
  • Brown 0;33

Replace digit 0 with 1 to get light color version.

]]> http://jeffbarr.com/linux/bash-configuration-notes/feed/ 0 Beginner Rails: Heroku http://jeffbarr.com/development/beginner-rails-heroku/ http://jeffbarr.com/development/beginner-rails-heroku/#comments Sat, 09 Apr 2011 09:28:52 +0000 Jeff http://jeffbarr.com/?p=140 Heroku is pretty cool: a free host for your rails apps that also works really well with git/github. Since my current hosting has some pretty odd hosting for rails, I’ll be using heroku to host my demo apps. While adding a demo app, I received this error:

heroku keys:add …/custom_require.rb:36:in `require’: no such file to load — readline (LoadError)

According to dirk.net, this error is due to missing libraries after installing ruby from source.

The provided fix worked just fine for me:

sudo apt-get install libncurses5-dev
sudo apt-get install libreadline5-dev

After that, I cd to where I unpacked the Ruby source and ran:

ruby extconf.rb
make
sudo make install

heroku keys:add worked fine from there. Thanks to dirk.net for the fix.

]]> http://jeffbarr.com/development/beginner-rails-heroku/feed/ 0 Beginner Rails: Ruby on Rails on Ubuntu 10.04 http://jeffbarr.com/development/ruby-on-rails-on-ubuntu-10-04/ http://jeffbarr.com/development/ruby-on-rails-on-ubuntu-10-04/#comments Sat, 09 Apr 2011 08:42:25 +0000 Jeff http://jeffbarr.com/?p=134 In my quest to get ruby on rails up and running on all three OSes tat live in my house (windows, mac OSX leopard, linux), I ran into a snag in the install process on Ubuntu 10.04.

Ruby v 1.8.7 was alive and well, however, following the steps at rubyonrails.org, when I tried to update gem:
sudo gem install rails
OR
sudo gem update –system
I received this error:

/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require’:
no such file to load — zlib (LoadError)

Oddly enough, I received the same error when trying to create a rails app or start the rails server – even though rails *seemed* to be installed. Mysterious!
I had previously installed ruby via the synaptic package manager, gotten the same message, then tried again via sudo apt-get install ruby-full build-essential, none of which had relieved the issue.
So, searching the googlenet, I came across this post:
http://thoughtsincomputation.com/posts/ubuntu-and-ruby-191-zlib-missing
He had run into the same issue, and noted that the actual missing library was called zlib1g. I checked synaptic, and I had that installed – but, he noted that he had compiled Ruby from source, which I hadn’t tried. So, following his instructions:
sudo apt-get install zlib1g-dev

I then went to http://www.ruby-lang.org/en/downloads/ and got the source for version 1.9.2 (since this was the version I’m currently running on windows). I compiled ruby1.9.2 from source, and the problem was resolved.

]]> http://jeffbarr.com/development/ruby-on-rails-on-ubuntu-10-04/feed/ 2 The User Controls The OS, Not The Other Way Around http://jeffbarr.com/writing/the-user-controls-the-os-not-the-other-way-around/ http://jeffbarr.com/writing/the-user-controls-the-os-not-the-other-way-around/#comments Sun, 01 Aug 2010 06:57:29 +0000 Jeff http://jeffbarr.com/?p=51 I am not a Koan!

]]> http://jeffbarr.com/writing/the-user-controls-the-os-not-the-other-way-around/feed/ 0 Getting Wireless Adapter Working in Ubuntu 9.10 With RTL8192SE Linux driver http://jeffbarr.com/linux/getting-wireless-adaptor-working-in-ubuntu-9-10-with-rtl8192se-linux-driver/ http://jeffbarr.com/linux/getting-wireless-adaptor-working-in-ubuntu-9-10-with-rtl8192se-linux-driver/#comments Sun, 21 Feb 2010 23:41:12 +0000 Jeff http://jeffbarr.com/?p=18 If you have a Toshiba laptop, there’s a good chance it has a Realtek RTL8191SE Wireless LAN 802.11n PCI-E NIC or some minor variation of same. Realtek apparently doesn’t make it very easy to find drivers for linux for this card – the person who posted the driver said he got it from Realtek, and I don’t have any real reason to doubt that. It works for me, in any case. Here are the steps I took to be able to use WiFi on my Toshiba Satellite P505. YMMV, so feel free to give a thorough read of the problem and solutions available at the Ubuntu help/bug forums. The driver tarball is available to download from that thread. rtl8192se_linux_2.6.0010.1012.2009.tar.gz (1.3 MiB, application/x-tar)

only load the driver module to kernel and start up nic.
1. Build up the drivers from the source code
make
2. Copy firmware to /lib/firmware/ or /lib/firmware/(KERNEL_VERSION)/
cp -rf firmware/RTL8192SE /lib/firmware
or
cp -rf firmware/RTL8192SE /lib/firmware/(KERNEL_VERSION)
Note: This depends on whether (KERNEL_VERSION) subdirectory exists under /lib/firmware

3. Load driver module to kernel and start up nic.
./wlan0up

And now back to writing.

]]> http://jeffbarr.com/linux/getting-wireless-adaptor-working-in-ubuntu-9-10-with-rtl8192se-linux-driver/feed/ 0