Increasing information density

Go to a terminal and type

 gnome-desktop-item-edit --create-new ~/Desktop

You should get something like this:

Now, type the name of your launcher and the command you would issue from the terminal to start your application. If you click on the springboard, you can select an image for your launcher. Now you can lock it wherever it is most comfortable for you!

Here is a very good link about how to do it: http://www.rasadacrea.com/en/web-training-courses/howto-install-python

To sum it up:

1. Install the dependencies for python compilation on Ubuntu:

sudo apt-get install build-essential python-dev
sudo apt-get install zlib1g-dev libbz2-dev libcurl4-openssl-dev 
sudo apt-get install libncurses5-dev libsqlite0-dev libreadline-dev 
sudo apt-get install libgdbm-dev libdb4.8-dev libpcap-dev tk-dev 
sudo apt-get -y build-dep python
sudo apt-get -y install libreadline-dev

2. Download and untar the relevant Python version (here 2.7.6):

wget https://www.python.org/ftp/python/2.7.6/Python-2.7.6.tgz
tar xfz Python-2.7.6.tgz

3. cd into the untared Python folder and run the configure and make scripts

cd Python-2.7.6
./configure
make

4. Make alt-install (it is important to make the alt-install and not install so that $python
returns the systsem version (question of stability) )

sudo make altinstall

5. Clean up

cd .. 
sudo rm -r Python-2.7.6*

6. Now you can access to different version of python:

• the one that came originally:

which python
python

• and the one you need for your other needs

which python2.7
python2.7

Step1:  Go to the python official download page and download the python interpreter versions you are interested in.

Step2: Install them, by ctrl-clicking on the .mpkg file and choosing to open it with the installer (required to override the fact that the python interpreters are incompatible with the new Guardian secure installation system)

Step3: as described in pip installation guide:

–  issue interpreter version-specific setup tools install:

pythonX.X ez_setup.py

– install version-specific pip installation:

 pythonX.X get-pip.py

Step4: add the pip-X.X specific directory to your path:

nano ~/.bash_profile

and

export PATH=$PATH:/Library/Frameworks/Python.framework/Versions/X.X/bin

Now that you’re done, please verify that the clang is installed and is in your system path. If this is not the case you might experience some trouble installing python modules requiring to be compiled.

Add-on: to install LAPCKs and ATLAS (very useful for Scipy, follow this tutorial )

Just to play around.

Step1: Install HBase:

follow http://hbase.apache.org/book/quickstart.html,

configuration variables:

hbase.rootdir = /opt/hadoop_hb/hbase
hbase.zookeeper.property.dataDir = /opt/hadoop_hb/zookeeper

putting it to the /opt/ file allows other users (such as specific database-attributed users) to access the necessary files without having to mix up with my /usr/ directory files.

Attention: since /opt/ belongs to root don’t forget to

sudo mkdir /opt/hadoop_hb
sudo chown <your_username> /opt/hadoop_hb

if you want to play with hbase from it’s shell

Attention: if youy are using Ubuntu, you will need to modify machine loopback, so that /etc/hosts look like:

127.0.0.1 localhost 
127.0.0.1 your_machine_name

Now you can start the hbase by typing

HBASE_HOME/bin/start-hbase.sh

and check if it is running by typing  in your browser

http://localhost:60010

(unless you’ve changed the default port h base connects itself to)

Step2: Install Elasticsearch:

For this download the elasticsearch.deb package from ElasticSearch official download website and run

sudo dpckg -i elasticsearch.deb

This will install the elasticsearch on your machine and add it to services launched from the start. Now you can check if it is working by typing in your browser (unless you’ve changed the default ports):

http://localhost:9200

Step3: Install TitanDB:

Once the HBase have been installed, download the TitanDB-Hbase .tar.gz and upack it into your directory of choice. once you’ve done with it, you can connect to it via gremling by typing

 gremlin> g = TitanFactory.open('bin/hbase-es.local')

to start it as a part of the embedded rexter server, configure type:

./bin/titan.sh config/titan-server-rexster.xml bin/hbase-es.local

Now you can check that the server is up and running by typing in your browser

http://localhost:8182/graphs

You’re done!

Regardless the fact that many totorials recommend to modify ~./bashrc in order ot perform a permanent modification of PATH for a given user, this is not a way to go. According to the official Ubuntu StackExchange, the way to go is to use the ~/.pam_environment  folder, which is meant specifically for such modifications.

However, pay attention to the fact that you have to follow the pam_environment-specific synthax and thus type

PATH DEFAULT=${PATH}:/path/to/wherever/your/binaries/are