Exercises, examples and other material relating to training module R113. This module is presented on Private Courses
and Specially Run Courses
|Articles and tips on this subject||updated|
|4678||Expect with Ruby - a training example to get you started|
The Expect library, originally written for use wth Tcl, is also available in other languages and today I wrote an example to introduce how it's used in Ruby. Please note this is a spike solution - not going to fail (if it does) in a pretty way.
The principle of expect is that you spawn a process - ...
|4676||Running shell (operating system) commands from within Ruby|
Ruby is an excellent systems admin / scripting tool, allowing other shells and processes to be run from within a Ruby program in various ways.
Using backtics or the %x notation, commeand output on STDOUT is routed back into a variable - for example:
first = `grep -c option247 ac_20160516 ...
|4553||RUby - loading, using, changing, storing JSON format data|
json is an excellent data exchange format - it "serialises" a data structure that consists of arrays and hashes (or whatever ordered and unordered collections are called in the language you're using) so that the structure can be saved, transferred between programs and computers, and reloaded easily.
|4502||Reading and parsing a JSON object in Ruby|
Here's a series of three new examples, building up from one another, showing the reading of a JSON feed from a remote web site in Ruby, and the analysis and presentation of that data.
The first example - [here] - shows the loading of extra modules to handle reading from the web and the JSON format, ...
|4008||Reading and checking user inputs - first lessons - Ruby|
Early programming exercises on a "learning to program in Xxxx" course involve asking the user to enter some pieces of data (usually numbers), doing a calculation using those numbers, and printing out a result. For that's a quite common requirement for a simple program - and this is the first realistic ...
Examples from our training material
|cashell|| Calling Shell commands from Ruby|
|exprub|| Ruby server check with Ruby - Expect|
|jload|| making use of data in a JSON object|
|tj3.rb|| Descending into a complex (json) object|
|wread|| Read a web resource into a program|
Some modules are available for download
as a sample of our material or under an Open Training Notes License
for free download from [here]
Topics covered in this module
File objects - finding our about files.
File system handling - glob, seek, tell, mkdir, etc.
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