PowerShell Fundamentals

Overview

PowerShell is an object-oriented scripting shell for task automation and system administration. Commands return structured objects, not plain text.

Core Concepts

• Cmdlets follow Verb-Noun naming
• Pipelines pass objects between commands
• Parameters provide predictable command behavior
• Scripts package repeatable operations

flowchart LR
    A[Get-Process] --> B[Where-Object]
    B --> C[Sort-Object]
    C --> D[Export-Csv]

Practical Example

Get-Service |
  Where-Object { $_.Status -eq 'Running' } |
  Sort-Object DisplayName |
  Select-Object Name, Status

Production Example

A daily operations script exports failed Windows services for incident triage.

Get-Service |
  Where-Object { $_.Status -eq 'Stopped' } |
  Select-Object Name, DisplayName |
  Export-Csv .\stopped-services.csv -NoTypeInformation

Common Pitfalls

• Treating PowerShell output as unstructured strings
• Using aliases in production scripts
• Ignoring -ErrorAction behavior

Key Takeaways

• PowerShell pipelines are object-first and highly composable.
• Consistent cmdlet naming improves script readability.
• Small repeatable scripts reduce manual operations work.