Tutorial by Examples: s

Creating subroutines

Subroutines are created by using the keyword sub followed by an identifier and a code block enclosed in braces. You can access the arguments by using the special variable @_, which contains all arguments as an array. sub function_name { my ($arg1, $arg2, @more_args) = @_; # ... } Sin...

Basic Usage

Basic table usage includes accessing and assigning table elements, adding table content, and removing table content. These examples assume you know how to create tables. Accessing Elements Given the following table, local example_table = {"Nausea", "Heartburn", "Indigesti...
Lua • Tables

External CSS Stylesheet

<link rel="stylesheet" href="path/to.css" type="text/css"> The standard practice is to place CSS <link> tags inside the <head> tag at the top of your HTML. This way the CSS will be loaded first and will apply to your page as it is loading, rather th...

JavaScript

Synchronous <script src="path/to.js"></script> Standard practice is to place JavaScript <script> tags just before the closing </body> tag. Loading your scripts last allows your site's visuals to show up more quickly and discourages your JavaScript from trying to...

Templating in Class Based Views

You can pass data to a template in a custom variable. In your views.py: from django.views.generic import TemplateView from MyProject.myapp.models import Item class ItemView(TemplateView): template_name = "item.html" def items(self): """ Get all Ite...

A simple Dockerfile

FROM node:5 The FROM directive specifies an image to start from. Any valid image reference may be used. WORKDIR /usr/src/app The WORKDIR directive sets the current working directory inside the container, equivalent to running cd inside the container. (Note: RUN cd will not change the current ...

Accumulate a list of trap work to run at exit.

Have you ever forgotten to add a trap to clean up a temporary file or do other work at exit? Have you ever set one trap which canceled another? This code makes it easy to add things to be done on exit one item at a time, rather than having one large trap statement somewhere in your code, which may...

SSL Certs Expiring

This data is collected by the http_unit and scollector. It warns when an alert is going to expire within a certain amount of days, and then goes critical if the cert has passed the expiration date. This follows the recommended default of warn and crit usage in Bosun (warn: something is going to fail...

Embedded Templates and CSS Styles

You can embed another template body into your template via {{template "mysharedtemplate" .}} to reuse shared components. Here is an example that creates a header template that can be reused at the top of all other template bodies. It also uses CSS to stylize the output so that it is easier...

Generic Template with optional Graphs

It often is faster to use a generic template when first creating a new alert and only specialize the template when you need to display more information. The following template will display a subject with a numerical value, custom formatting, and description string and then a body with up to two grap...

Graph using Alert Variable

Using .Graph will filter the results to only include those that match the tagset for the alert. For instance an alert for os.low.memory{host=ny-web01} would only include series with the host=ny-web01 tags. If multiple series match then only the first matching result will be used. template graph.tem...

GraphAll using Alert Variable

Using .GraphAll will include all the results in the graph. template graph.template { subject = ... body = `{{template "header" .}} <strong>GraphAll</strong> <div>{{.GraphAll .Alert.Vars.graph}}</div> <strong>GraphAll With Y Axis...

Graph or GraphAll using inline or dynamic query

Graph queries can be defined inline if you don't want to use an Alert variable. template graph.template { subject = ... body = `{{template "header" .}} <strong>Graph With Inline Query</strong> <div>{{.Graph "q(\"avg:300s-avg:os.mem.perce...

Filter, Sort, Limit and Graph

When using GraphAll you may still want to filter the results, in which case you can use an Alert variable with the Filter, Sort, and Limit functions. template graph.template { subject = ... body = `{{template "header" .}} <strong>Graph Filtered Variable</strong...

Using Merge to Combine Series

If you want to graph two series on one graph, you can use the Merge function. This can also be combined with the Series function to manipulate the Y axis (like forcing it to start at zero). template graph.template { subject = ... body = `{{template "header" .}} <stro...

Check if pattern matches input

public bool Check() { string input = "Hello World!"; string pattern = @"H.ll. W.rld!"; // true return Regex.IsMatch(input, pattern); }

Passing Options

public bool Check() { string input = "Hello World!"; string pattern = @"H.ll. W.rld!"; // true return Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase | RegexOptions.Singleline); }

Simple match and replace

public string Check() { string input = "Hello World!"; string pattern = @"W.rld"; // Hello Stack Overflow! return Regex.Replace(input, pattern, "Stack Overflow"); }

Match into groups

public string Check() { string input = "Hello World!"; string pattern = @"H.ll. (?<Subject>W.rld)!"; Match match = Regex.Match(input, pattern); // World return match.Groups["Subject"].Value; }

Creating a shared link for a file using the Dropbox Java library

This uses the Dropbox Java SDK to create a shared link for a file at the Dropbox path /test.txt: try { SharedLinkMetadata sharedLinkMetadata = client.sharing().createSharedLinkWithSettings("/test.txt"); System.out.println(sharedLinkMetadata.getUrl()); } catch (CreateSharedLinkW...

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