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PowerShell Scripting Basics
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Question 1
PowerShell cmdlets pass objects through the pipeline, unlike traditional shells that pass plain text strings.
Explanation
This is one of PowerShell's most powerful features and key differentiators. When you pipe in bash: `ls | grep foo` — grep receives plain text. In PowerShell: `Get-Process | Where-Object CPU -gt 10` — Where-Object receives full .NET Process objects with all properties (CPU, Memory, PID, Name, etc.). The receiving cmdlet can filter, sort, and manipulate these objects using their properties. This enables: `Get-Service | Where-Object {$_.Status -eq "Running"} | Stop-Service` — each command works with structured objects. `$_` (or `$PSItem`) is the current pipeline object.
Question 2
Which PowerShell operator is used for string interpolation within double-quoted strings?
Explanation
PowerShell string types: Double-quoted strings `"..."` — variables and escape sequences are expanded: `$name = "World"; "Hello $name"` → "Hello World". For expressions: `"Today is $(Get-Date -Format 'MM/dd/yyyy')"` — use `$()` subexpression. Single-quoted strings `'...'` — literal strings, NO expansion: `'Hello $name'` → "Hello $name" (literal dollar sign). Escape character is backtick (`) not backslash: `` `n `` = newline, `` `t `` = tab, `` `" `` = literal quote. String concatenation: `"Hello" + " " + "World"` also works but direct interpolation is more readable and idiomatic PowerShell.
Question 3
In PowerShell, `try { } [[blank1]] { } [[blank2]] { }` is the error handling structure where the middle block catches exceptions and the last block always executes regardless of whether an error occurred.
Explanation
PowerShell error handling structure:
```powershell
try {
# Code that might throw an error
Get-Content "C:\nonexistent.txt" -ErrorAction Stop
} catch [System.IO.FileNotFoundException] {
Write-Error "File not found: $_"
} catch {
Write-Error "Unexpected error: $($_.Exception.Message)"
} finally {
Write-Host "This always runs — cleanup code here"
}
```
`-ErrorAction Stop` converts non-terminating errors to terminating errors (catchable). `$_` in catch block is the error record. Multiple catch blocks handle different exception types. `finally` runs even if an exception occurs — used for cleanup (closing files, connections). `$Error[0]` holds the most recent error.
Question 4
The `$PSVersionTable` variable in PowerShell contains information about the current PowerShell version and can be used to write version-compatible scripts.
Explanation
`$PSVersionTable` is an automatic read-only hashtable containing: `PSVersion` (PowerShell version), `PSEdition` (Desktop for Windows PowerShell 5.x; Core for PowerShell 6+), `PSCompatibleVersions`, `BuildVersion`, `CLRVersion`, `WSManStackVersion`. Version checking in scripts: `if ($PSVersionTable.PSVersion.Major -ge 7) { # PS7 features }`. PowerShell 5.1 (Windows PowerShell) ships with Windows; PowerShell 7+ (Core) is cross-platform (Windows/Linux/macOS), open source, and has new features (ForEach-Object -Parallel, null coalescing ??). Scripts targeting both should handle version differences gracefully.
Question 5
The PowerShell cmdlet [[blank1]] converts output to HTML format, while [[blank2]] converts to CSV format, enabling easy export of data for reports and data sharing.
Explanation
PowerShell output formatting cmdlets: `ConvertTo-Html` — generates an HTML table from objects, supports -Head (CSS styles), -Title, -PreContent, -PostContent; pipe to `Out-File report.html` for file output. `Export-Csv` — creates a CSV file directly (more common); `-NoTypeInformation` removes header comment; `Import-Csv` reads CSV back as objects. `ConvertTo-Csv` outputs CSV strings to pipeline. `ConvertTo-Json` / `ConvertFrom-Json` — JSON conversion (API integration). `ConvertTo-Xml` — XML output. `Out-GridView` — interactive filterable GUI table (great for exploration). These enable PowerShell to serve as a powerful reporting and data export tool.