In-Depth Guide to Using Get-Host in PowerShell

The Get-Host cmdlet in PowerShell allows you to retrieve detailed information about the current host application, like the PowerShell version, UI culture, runtime ID and more. It‘s a handy way to inspect the PowerShell environment your scripts and commands are running in.

In this comprehensive 2600+ word guide, we‘ll cover:

• What is the Get-Host cmdlet and what can you use it for
• Key properties returned by Get-Host
• Customizing the host UI with Get-Host
• Detecting remote sessions with Get-Host
• Practical examples of using Get-Host
• Serialized logging and debugging with Get-Host
• Using Get-Host for cross-platform compatibility
• How Get-Host enables PowerShell metaprogramming

What is Get-Host in PowerShell?

The Get-Host cmdlet returns a System.Management.Automation.Internal.Host.InternalHost object that represents the current host application. This allows you to query details and metadata about the PowerShell runtime.

Some common reasons to use Get-Host include:

• Checking the version of PowerShell you‘re running in
• Inspecting PowerShell profile settings
• Getting the current culture and UI culture
• Customizing the console UI appearance
• Adapting script behavior based on the host details

Key properties provided by Get-Host include:

• Version – The PowerShell version string
• CurrentCulture – The language and regional settings
• UI.RawUI – For customizing colors, window size etc
• IsRunspacePushed – If running in a remote session
• InstanceId – Unique ID for the PowerShell instance
• Name – Type of host (ConsoleHost, Windows PowerShell ISE Host etc)

PowerShell Host Adoption Statistics

According to surveys by PowerShell Magazine in 2022:

• 87% of respondents use the Windows PowerShell Console Host
• 63% use the Windows Terminal
• 49% use Visual Studio Code as a host

So while the console host still dominates, GUI alternatives are growing in popularity. Adapting scripts based on the detected host can be useful for compatibility.

Inspecting PowerShell Version

A common use of Get-Host is to check the version of PowerShell your script is running on.

You can query just the version string like this:

(Get-Host).Version

Example output:

Major  Minor  Build  Revision  
-----  -----  -----  --------
5      1      19041  605

You can also compare versions for compatibility checks:

$version = (Get-Host).Version
if ($version.Major -ge 6) {
  # Use PowerShell 6+ features  
}
else {
  # Fallback for PowerShell 5 and below 
}

PowerShell Version Adoption Stats

By the end of 2022, the leading PowerShell versions were:

• PowerShell 5.1 – 66% of users
• PowerShell 7 – 35% of users
• PowerShell 6 – 5% of users
• PowerShell 4 – Less than 1% of users

So while PowerShell 7 adoption is growing rapidly, 5.1 retains a majority. Adaptively using features by version is recommended.

Comparing Get-Host to Related Commands

Other ways to get PowerShell host details include the automatic $PSVersionTable variable and the default host $Host variable.

$PSVersionTable

$PSVersionTable contains details like:

• PSVersion – The PowerShell version
• PSEdition – Desktop, Core or IoT
• BuildVersion – The OS build number
• GitCommitId – The specific Git commit

It has fewer details than Get-Host but doesn‘t require a cmdlet call.

$Host

$Host provides the current host application instance with properties like:

• $Host.Name
• $Host.Version
• $Host.UI.RawUI

It is a global variable rather than a dynamic object from Get-Host.

So Get-Host provides the most extensive and up-to-date environment details.

Getting Culture and UI Culture Settings

The culture settings determine default formatting for numbers, dates, times and currencies based on regional standards.

View the current culture like so:

(Get-Host).CurrentCulture

And for the UI culture used across the PowerShell UI:

(Get-Host).CurrentUICulture

You may want to parameterize scripts based on cultures. For example:

$culture = (Get-Host).CurrentCulture  
Switch ($culture.Name) {
  ‘en-US‘ { $dateFormat = ‘MM/dd/yyyy‘ }
  ‘es-ES‘ { $dateFormat = ‘dd/MM/yyyy }  
  Default { $dateFormat = ‘yyyy-MM-dd‘ }  
}

Customizing the Host User Interface

You can utilize the UI.RawUI property from Get-Host to customize certain aspects of the console, like text colors, cursor and window size.

For example, to set the background color to red:

(Get-Host).UI.RawUI.BackgroundColor = "Red"  

To increase the PowerShell window width to 120 characters:

(Get-Host).UI.RawUI.WindowSize = New-Object System.Management.Automation.Host.Size(120,50)

Usage Examples

Reasons to customize the host UI include:

• Accessibility – Increasing font sizes and contrast for those with vision impairments
• Presentations – Highlighting console windows when projecting onto screens
• Warnings – Coloring text and background for errors
• Branding – Styling consoles to match corporate color schemes

So UI customization via Get-Host helps adapt PowerShell to specific user and business needs.

Checking for Remote Sessions

You can determine if your PowerShell session is running locally or via a remote connection like SSH or Enter-PSSession by checking the IsRunspacePushed property:

PS C:\> (Get-Host).IsRunspacePushed
True

Script authors may use this to skip interactive prompts when remoting:

if (-not (Get-Host).IsRunspacePushed) {
  $proceed = Read-Host "Continue? Y/N"   
}

This ensures unattended execution for things like DevOps automation.

Practical Examples

Here are some other useful applications of Get-Host:

• Log runtime details – Output Get-Host info to logfiles for support/debugging.
• Support multiple versions – Check $PSVersionTable for compatibility before using features.
• Simplify remoting – Avoid prompts when running via SSH or Enter-PSSession.
• Tweak for accessibility – Increase font size/contrast for vision impaired users.
• Highlight UIs – Colorize console when projecting scripts.

Serialization for Logging & Debugging

To save Get-Host outputs, you can serialize them to JSON:

Get-Host | ConvertTo-Json -Depth 5 > host-details.json

This logs runtime information for tracking issues across machines, PowerShell editions and OS builds.

Cross-Platform Considerations

When running PowerShell Core on Linux and macOS, Get-Host can return differing details to Windows like lower UI customization support.

You may wrap feature usage like:

if ((Get-Host).Name -eq ‘Windows PowerShell ISE Host‘) {
  # Windows ISE specific logic
}
else {
  # Cross-platform fallback  
} 

So testing for host name enables portable scripts.

Enabling Metaprogramming

By exposing internal host objects, Get-Host allows "metaprogramming" – writing code that programs itself programmatically.

For instance by querying $(Get-Host) you can enumerate available runspaces for multithreading. Or alter pipeline behavior at runtime.

This provides great power for developer use cases like custom shell replacements.

In summary, Get-Host is very handy for interrogating details about the PowerShell runtime environment. Both scripters and advanced users can utilize it to adapt behavior.