Windows Powershell

Windows PowerShell Commands

⚠️ CRITICAL: NEVER Use && in PowerShell

PowerShell does NOT support && for command chaining. Use semicolons ; instead.

# ❌ WRONG - Will fail
cd embedded-components && yarn test

# ✅ CORRECT - Use semicolon
cd embedded-components; yarn test

# ✅ ALSO CORRECT - Separate commands
cd embedded-components
yarn test

Command Chaining

Semicolon (;) - Execute Regardless

Runs the second command even if the first fails:

cd embedded-components; yarn test

Pipeline (|) - Pass Output

Passes output from one command to another:

Get-ChildItem | Where-Object { $_.Extension -eq ".tsx" }

Logical AND (-and) - Conditional Execution

PowerShell equivalent of &&:

if (Test-Path embedded-components) { cd embedded-components; yarn test }

Common Development Commands

Navigation

# Change directory
cd embedded-components

# Go to parent
cd ..

# Go to root
cd \

# List contents
Get-ChildItem
# or shorthand
ls
dir

File Operations

# Create file
New-Item -Path "file.txt" -ItemType File

# Create directory
New-Item -Path "folder" -ItemType Directory

# Remove file
Remove-Item -Path "file.txt"

# Remove directory recursively
Remove-Item -Path "folder" -Recurse -Force

# Copy file
Copy-Item -Path "source.txt" -Destination "dest.txt"

# Move file
Move-Item -Path "source.txt" -Destination "dest.txt"

Package Management

# Install dependencies
cd embedded-components; yarn install

# Run tests
cd embedded-components; yarn test

# Run specific script
cd embedded-components; yarn format

# Multiple commands
cd embedded-components; yarn format; yarn lint:fix; yarn test

Git Operations

# Status
git status

# Add files
git add .

# Commit
git commit -m "feat: add new component"

# Push
git push

# Pull
git pull

# Create branch
git checkout -b feature/new-feature

# Multiple git commands
git add .; git commit -m "fix: update tests"; git push

Process Management

# Find process by port
netstat -ano | findstr :3000

# Kill process by PID
taskkill /PID 1234 /F

# Stop all node processes
Get-Process node | Stop-Process -Force

Environment Variables

# Set environment variable (current session)
$env:NODE_ENV = "development"
$env:NODE_OPTIONS = "--max-old-space-size=4096"

# Use environment variable
Write-Output $env:NODE_ENV

# Set for command execution
$env:NODE_ENV="test"; yarn test

Path Operations

# Get current directory
$PWD
Get-Location

# Check if path exists
Test-Path "embedded-components"

# Get absolute path
Resolve-Path "embedded-components"

# Join paths
Join-Path "embedded-components" "src"

File Search

# Find files by name
Get-ChildItem -Recurse -Filter "*.tsx"

# Find files with content
Select-String -Path "*.tsx" -Pattern "useEffect"

# Find and count
(Get-ChildItem -Recurse -Filter "*.test.tsx").Count

Text Processing

# Read file
Get-Content "file.txt"

# Write file
"content" | Out-File "file.txt"

# Append to file
"content" | Add-Content "file.txt"

# Search and replace
(Get-Content "file.txt") -replace "old", "new" | Set-Content "file.txt"

Development Workflow Commands

Complete Test Workflow

# Navigate and run tests
cd embedded-components; yarn test

# Fix formatting and linting
cd embedded-components; yarn format; yarn lint:fix

# Re-run tests
cd embedded-components; yarn test

# If all pass, commit
git add .; git commit -m "fix: update component"; git push

Build and Deploy

# Clean, install, build
cd embedded-components; Remove-Item -Recurse -Force node_modules; yarn install; yarn build

# Run Storybook
cd embedded-components; yarn storybook

Cache Management

# Clear yarn cache
cd embedded-components; yarn cache clean

# Remove node_modules and reinstall
cd embedded-components; Remove-Item -Recurse -Force node_modules; yarn install

# Clear all caches
cd embedded-components; yarn cache clean; Remove-Item -Recurse -Force node_modules, .cache; yarn install

PowerShell-Specific Features

Aliases

# Common aliases
ls    # Get-ChildItem
dir   # Get-ChildItem
cd    # Set-Location
pwd   # Get-Location
cat   # Get-Content
rm    # Remove-Item
cp    # Copy-Item
mv    # Move-Item

Execution Policy

# Check current policy
Get-ExecutionPolicy

# Set execution policy (admin required)
Set-ExecutionPolicy RemoteSigned

Profile

# Edit PowerShell profile
notepad $PROFILE

# Reload profile
. $PROFILE

Error Handling

# Try-catch block
try {
    cd embedded-components
    yarn test
} catch {
    Write-Error "Command failed: $_"
}

# Check if command succeeded
if ($LASTEXITCODE -eq 0) {
    Write-Output "Success"
} else {
    Write-Output "Failed with code $LASTEXITCODE"
}

Variables and Strings

# Variables
$projectPath = "embedded-components"
$command = "yarn test"

# String interpolation
cd $projectPath; Invoke-Expression $command

# Here-strings for multi-line
$script = @"
cd embedded-components
yarn format
yarn lint:fix
yarn test
"@
Invoke-Expression $script

Common Patterns

Conditional Navigation and Execution

if (Test-Path "embedded-components") {
    cd embedded-components
    yarn test
} else {
    Write-Error "Directory not found"
}

Loop Through Files

Get-ChildItem -Recurse -Filter "*.test.tsx" | ForEach-Object {
    Write-Output "Testing: $($_.Name)"
    yarn test $_.Name
}

Backup and Restore

# Backup
Copy-Item -Path "embedded-components" -Destination "embedded-components-backup" -Recurse

# Restore
Remove-Item -Path "embedded-components" -Recurse -Force
Move-Item -Path "embedded-components-backup" -Destination "embedded-components"

Best Practices

1. Use semicolons (;) - Never use &&
2. Quote paths with spaces - Use quotes for paths containing spaces
3. Use cmdlet names - Prefer Get-ChildItem over ls in scripts
4. Check exit codes - Use $LASTEXITCODE to verify command success
5. Use try-catch - For error-prone operations
6. Test paths - Use Test-Path before operations
7. Be explicit - Use full cmdlet names in important scripts

Common Mistakes

❌ Using && for command chaining
❌ Not quoting paths with spaces
❌ Forgetting to check $LASTEXITCODE
❌ Not handling errors
❌ Using forward slashes in paths (use backslashes or forward slashes, but be consistent)

Quick Reference

# Navigate to project
cd i:\ds\projects\oss\embedded-banking\embedded-components

# Run quality workflow
yarn test

# Fix issues
yarn format; yarn lint:fix

# Re-test
yarn test

# Commit changes
cd ..; git add .; git commit -m "feat: new component"; git push

References

• See .github/copilot/prompts/ for related prompts
• See .github/copilot/skills/code-quality-workflow/ for testing workflow
• Microsoft PowerShell documentation: https://docs.microsoft.com/powershell/