PowerShell Safe Chain

Chain commands reliably on Windows PowerShell. No && anti-patterns.

Problem

PowerShell differs from bash:

• && does NOT work for command chaining
• Parameter parsing is case-insensitive but strict
• Errors continue by default (no fail-fast)
• Path separators vary (\ vs /)

Workflow

1. Safe Chaining Pattern

Wrong:

mkdir test && cd test && echo done

Right:

$ErrorActionPreference = 'Stop'
try {
    New-Item -ItemType Directory -Path test -Force
    Set-Location test
    Write-Host 'done'
} catch {
    Write-Error "Failed at step: $_"
    exit 1
}

2. Conditional Chaining

# If-then pattern
if (Test-Path $file) {
    Remove-Item $file
    Write-Host "Deleted"
} else {
    Write-Warning "File not found"
}

# Pipeline with error handling
Get-Process | Where-Object CPU -GT 100 | Stop-Process -WhatIf

3. Splatting for Complex Commands

$params = @{
    Path = $filePath
    Encoding = 'UTF8'
    Force = $true
}
Set-Content @params

Executable Completion Criteria

Privacy/Safety

• No hardcoded credentials
• Use [SecureString] for passwords
• Environment variables via $env:VAR

Self-Use Trigger

Use when:

• Writing any PowerShell script
• Chaining 2+ commands
• Executing file operations

Chain safely. Fail explicitly.