![]() Only update the device if the record has changed every 3-4 hours.Just update the associated NetBox Device every time I pull data from OneView, to the tune of every 3-4 hours.This Compare-Object business came up because I need to take a hash table pulled from OneView and I need to write the key value pairs into our NetBox DCIM for automated inventory writes. PS > Compare-Object -ReferenceObject $SPEC01 -DifferenceObject $SPEC03īut when it comes to key/value pairs, otherwise known as “Property Values” in Powershell, Compare-Object, by default, will only compare the existence of the key value pairs using these defaults, not a change in their data. If you are comparing single elements in an array, like: What does that mean? What it really means, is that you will need to be very specific about what you are comparing. If the IncludeEqual parameter is used, ( =) indicates the value is in both objects. The result of the comparison indicates whether a property value appeared only in the reference object ( ). The relevant part of the definition is as follows: It is also very common to have a robot take action(s) as a result.īut at what level do I need to compare? Am I looking for a character that has changed? A value to be altered? Am I simply looking for an element to be added or subtracted? Maybe all of the above? The Official (Abridged) Definition: Compare-Object all the freaking time!įurthermore, it is very common to compare two or more hash tables to see if data has changed or is different in one or the other. In the World of IT Infrastructure, how often do we deal with this in PowerShell or any modern programming language for that matter? It has field names (keys), with data for each (values). A PowerShell hash table is an array with key value pairs, like an Excel spreadsheet. What are Hash Tables?īefore we can go deeper on what Compare-Object does, let’s make sure we know what a hash table is. Īs for any disclaimers, my usual approach is to give you working prod-level code, but I decided to go with a more simple on-the-fly example using computer/vm specs so that we can get the concept down here. The Compare-Object PowerShell CmdLet seems like an easy tool to accomplish a diff, but with hash tables. AMIRITE?Īnyway, I grew up in a world where diff (or tools like it) made things very easy. I guess I’ll see you next week, but you should make sure it’s not your Dunning-Kruger Effect making you think you know what it does. If you already know exactly what PowerShell’s Compare-Object does, then whoop-de-freaking doo! I guess you are a master PowerShell. Screenshot example of the Compare-Object CmdLet.
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