Choose an open source licence

I was trying to find an open source licence that would fit my purpose for my Trend Analyser project. After some googling I found a wonderful website “Choose a Licence

This showed specifically what each main licence does and gave templates to use. It made it easier than reading through and trying to understand all the legal terms.

In the end I choose a MIT licence for Trend Analyser because I wanted anyone to be able to use or sell the modified code and only wanted a licence that covered me and allowed attribution.

Selection/Click and drag doesnt work in Gmail – Opera

In opera normally click and drag or selection doesn’t work. This is because in opera Gmail serves up some CSS that breaks the display and stops you clicking and dragging text.

To fix this, you can enable opera’s list of JavaScript changes, to make popular sites work. This is done by visiting: http://www.opera.com/docs/browserjs/

Add a user to a group in Linux

How to add a user to a group in Linux

usermod -a -G  

Its a simple as that. So for me adding the user “chewett” to the user “vboxusers” i run the command

usermod -a -G vboxusers chewett

The -a flag means that the new group is appended, without it you will overwrite your current groups with the specified one, In nearly all cases this is not what you want to do!

Could not access network location \Hewlett-Packard\\

When trying to install MySQL Server it failed with the message “Could not access network location \Hewlett-Packard\\”

After some searching it turns out this is a common issue where HP have inserted a registry entry with the install path of “\Hewlett-Packard\\” which isnt a valid location. This can be resolved by removing this entry. This is safe to do so.

If you dont know what the registry is, you probably want to talk to someone who does or do some research, but using the search tool to find “\Hewlett-Packard\\” and delete the entry should fix the issue. It could be in a number of places but will likely be under an “uninstall” path.

As usual, when playing with the registry, use caution, ask others if unsure, and back it up.

Full error log mysql installer gave me:

1:
1: Action 11:31:29: INSTALL.
1: 1: MySQL Server 5.6 2: {0B9D4C33-AC1B-4973-B754-FE9EAB03D327}
1: Action 11:31:29: FindRelatedProducts. Searching for related applications
1: Action 11:31:29: AppSearch. Searching for installed applications
1: Action 11:31:29: LaunchConditions. Evaluating launch conditions
1: Action 11:31:29: ValidateProductID.
1: Action 11:31:29: CostInitialize. Computing space requirements
1: Action 11:31:29: FileCost. Computing space requirements
1: Action 11:31:29: CostFinalize. Computing space requirements
1: Could not access network location \Hewlett-Packard\\.
1: Could not access network location \Hewlett-Packard\\.
1: 1: MySQL Server 5.6 2: {0B9D4C33-AC1B-4973-B754-FE9EAB03D327} 3: 3
1:
1: Final actions.
1: Install error

Location of GeoIP.dat for PHP

To find the location of GeoIP for PHP you can ssh into the server and use the “find” command.

find / -iname GeoIP.dat

Will return a list of file paths where the file with this name is found. In my case I found:

/usr/share/GeoIP/GeoIP.dat
/usr/local/share/GeoIP/GeoIP.dat
/opt/geoip/share/GeoIP/GeoIP.dat

In my case the bottom link was the one that PHP was searching for, To confirm this i moved the file and PHP started to complain that it couldn’t find the file.

Previously because I was updating the wrong file it didn’t update my install so PHP was returning old and wrong data.

Show trailing whitespace in Vim

A small snippet of code showing trailing whitespace being shown in vim
A small snippet of code showing trailing whitespace being shown in vim

Vim is a wonderful command line text editor with syntax highlighting and everything you could ask for provided you turn on the functionality. Recently i was shown that it was also show trailing whitespace with a quick addition to the .vimrc file.

All you need to do is add the following:

set list
set listchars=tab:→\ ,trail:☃

Thanks to Sam for showing me this, Here is his full vimrc or a directory of all of his settings files. Have a browse!

 

Using Nvidia Optimus on Fedora

If your computer is recent and has an i3/i5/i7 intel core and a Nvidia graphics card it likely uses Optimus technology. This smart piece of software turns off the power-hungry Nvidia graphics card and runs most programs on the integrated intel graphics chip. In laptops this can save a lot of power. However this solution is only available in windows 7 upwards.

The problem occurs when you are using an operating system that doesn’t support this, as in most cases both cards will run all the time, causing major battery drain. On laptops this can severely shorten the battery life.

However there is a solution to this called bumblebee. This piece of software aims to offer similar technology in Linux-based machines. I found many tutorials on how to install it and work and ended up reinstalling fedora (17 at the time) several times.

However, I found a post from the NC State University Technical Staff Exchange on how to install bumblebee for Fedora and Redhat based distributions. I used this before to install on Fedora 17 and now just today on Fedora 18. Previously I was having a lot of issues getting it to work on Fedora 18 and according to them “nouveau drivers do not work on fedora 18 at this time” which after following their guide and installing the Nvidia ones it started to work.

If you are running a laptop with a new intel core and Nvidia graphics card and are getting poor battery life, I suggest you looking into seeing if you have Optimus technology in your laptop, and if so try this.

However, there is a warning, you will be messing around with your display drivers which could cause your system to not be able to display any GUI. Back up everything before trying this.

As usual, if you have any questions, it worked for you or you have something to add to my post, leave a comment!