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How to Use Special Keys in UNIX

UNIX operating system has some special keys. These you can use to interrupt the program processing or to resume it. The file management and keys totally different in UNIX kinds of operating systems. 



An example of a UNIX special key and its use.
Special Keys in UNIX much useful to take action  when something happens.

1. Why You Need Program Interruption in UNIX.

A scenario where you made some mistake in the input command and you need to stop the further process. Then you can use the CTRL+C command. It is equal to the DELETE command.

2. List of UNIX Special Keys.

RETURN key 
The RETURN key signifies the end of a line of input. On any terminal, RETURN has a key of its own, or return may be typed by holding down the control key and typing a 'm'.

CTRL-m Key
Hint: Ctrl-m command is equal to RETURN key in Unix systems


DELETE Key
The DELETE key stops a program/command immediately, without waiting for it to finish. DELETE can be achieved equivalently with ctrl-c.
Hint: Ctrl-c Command you can use …

Advanced Oozie for Software developers (Part 1 of 3)

Introduction to Oozie Places or points of interest are specific locations that may be important to some people. Those locations are additionally associated with data that explains what is interesting or important about them.
Oozie for developers
Image courtesy|Stockphotos.io

How People Gather Data..

These are typically locations where people come for entertainment, interaction, services, education, and other types of social activities. Examples of places include restaurants, museums, theaters, stadiums, hotels, landmarks, and so on. Many companies gather data about places and use this data in their applications.

In the telecommunications industry, probes are small packages of information sent from mobile devices. The majority of "smartphones" send probes regularly when the device is active and is running a geographical application (such as maps, navigation, traffic reports, and so on).

The probe frequency varies for different providers (from 5 seconds to 30 seconds).

Probes are normally directed to phone carriers such as Verizon, Sprint, ATandT, and/or phone manufacturers such as Apple, Nokia, HTC, and so on.

Different steps in validating location of customers

  1. Select probes data for a specified time interval, as well as a location from the probes repository.
  2. Extract probes strands. The idea here is to discover groups of probes from a particular device that belong to an individual who spent some time in one location. More precisely, a usual technique here includes classifying probes strands (such as pedestrians or traffic) and extracting "stay points" from pedestrian strands. 
  3. Distribute the strands into geotiles. In practice, it is convenient to use several geotile systems in parallel with different tile sizes (geohash levels).
  4. Geotiling is the partitioning of a space into a finite number of distinct shapes. This implementation uses equal-sized bounding boxes. A zoom level defines the size of the tiles. Typically, for the zoom level n, the number of tiles for the world is 2n.
  5. Distribute the places into geotiles.
  6. Calculate a location attendance index. The location attendance index captures the number of strands located in the proximity of a location, usually associated with a group of places. That enables you to estimate how many people attend places, how long people remain in places, and the distribution of these parameters over time.
  7. Cluster stay points by geographical locations, and use clusters not associated with the currently known places for discovery of new place candidates.

What is the role of Oozie..

Oozie does not require special programming for any of the Oozie actions. For example, any existing Pig script or any HQL script can be used as is inside of Oozie actions.

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