On The Power Of Calculated Properties In Powershell🔗

The aim of this page📝 is to show where I’ve used calculated properties in posh, basically for advanced querying of a file system when I wanted to get the table where each file would have a parent folder next to it. I am using this one for the creation of markdown-based boards for tracking e.g. learning progress of a course that I have in .mp4 format.

• Posh calculated properties are powerful map functions you can apply to any object arriving through the pipeline with the Select-Object cmdlet.

folder                               Name
------                               ----
10. Course Overview                  10. Course Overview.mp4
11. Course Introduction              10. Course Introduction.mp4
12. Getting Docker                   10. Module Overview.mp4
12. Getting Docker                   11. Docker Desktop.mp4
12. Getting Docker                   12. Play with Docker.mp4
13. Deploying a Containerized App    10. Module Overview.mp4
13. Deploying a Containerized App    11. Warp Speed Run-through.mp4
13. Deploying a Containerized App    12. Containerizing an App.mp4
13. Deploying a Containerized App    13. Hosting on a Registry.mp4
13. Deploying a Containerized App    14. Running a Containerized App.mp4
13. Deploying a Containerized App    15. Managing a Containerized App.mp4
13. Deploying a Containerized App    16. Recap.mp4
14. Microservices and the Real World 10. Module Overview.mp4
14. Microservices and the Real World 11. Cloud-native Microservices.mp4
14. Microservices and the Real World 12. Multi-container Apps with Docker Compose.mp4
14. Microservices and the Real World 13. Taking Things to the Next Level with Docker Swarm.mp4
14. Microservices and the Real World 14. Microservices and Docker Services.mp4
14. Microservices and the Real World 15. Multi-container Apps with Docker Stacks.mp4
15. What's Next-                     10. What's Next-.mp4

EXAMPLE 2: LIST OF FOLDERS AND FILECOUNTS

• From https://stackoverflow.com/a/45948488/11082684

Get-ChildItem $rootFolder `
    -Recurse -Directory | 
        Select-Object `
            BaseName, `
            @{Name="FileCount";Expression={(Get-ChildItem $_ -File | 
        Measure-Object).Count }} | Format-Table
AWS                           33
bash                          79
bi                            37
bookmarks                    232
books                          2
C                              1
c-sharp                       35
clojure                       18
cloud                         21
cs                            79
csgt                           8
DATA                           9

LINKS

• Windows PowerShell Tip: Using Calculated Properties — Microsoft Docs
• powershell — Recursively count files in subfolders — Stack Overflow