Get GitHub Copilot for CLI in Powershell by adding the contents here to your $Profile. Ensure that you have installed and authenticated in the GitHub CLI to make it work properly.

PowerShell_profile.ps1

function ghcs {
	# Debug support provided by common PowerShell function parameters, which is natively aliased as -d or -db
	# https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_commonparameters?view=powershell-7.4#-debug
	param(
		[Parameter()]
		[string]$Hostname,

		[ValidateSet('gh', 'git', 'shell')]
		[Alias('t')]
		[String]$Target = 'shell',

		[Parameter(Position=0, ValueFromRemainingArguments)]
		[string]$Prompt
	)
	begin {
		# Create temporary file to store potential command user wants to execute when exiting
		$executeCommandFile = New-TemporaryFile

		# Store original value of GH_* environment variable
		$envGhDebug = $Env:GH_DEBUG
		$envGhHost = $Env:GH_HOST
	}
	process {
		if ($PSBoundParameters['Debug']) {
			$Env:GH_DEBUG = 'api'
		}

		$Env:GH_HOST = $Hostname

		gh copilot suggest -t $Target -s "$executeCommandFile" $Prompt
	}
	end {
		# Execute command contained within temporary file if it is not empty
		if ($executeCommandFile.Length -gt 0) {
			# Extract command to execute from temporary file
			$executeCommand = (Get-Content -Path $executeCommandFile -Raw).Trim()

			# Insert command into PowerShell up/down arrow key history
			[Microsoft.PowerShell.PSConsoleReadLine]::AddToHistory($executeCommand)

			# Insert command into PowerShell history
			$now = Get-Date
			$executeCommandHistoryItem = [PSCustomObject]@{
				CommandLine = $executeCommand
				ExecutionStatus = [Management.Automation.Runspaces.PipelineState]::NotStarted
				StartExecutionTime = $now
				EndExecutionTime = $now.AddSeconds(1)
			}
			Add-History -InputObject $executeCommandHistoryItem

			# Execute command
			Write-Host "`n"
			Invoke-Expression $executeCommand
		}
	}
	clean {
		# Clean up temporary file used to store potential command user wants to execute when exiting
		Remove-Item -Path $executeCommandFile

		# Restore GH_* environment variables to their original value
		$Env:GH_DEBUG = $envGhDebug
	}
}

function ghce {
	# Debug support provided by common PowerShell function parameters, which is natively aliased as -d or -db
	# https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_commonparameters?view=powershell-7.4#-debug
	param(
		[Parameter()]
		[string]$Hostname,

		[Parameter(Position=0, ValueFromRemainingArguments)]
		[string[]]$Prompt
	)
	begin {
		# Store original value of GH_* environment variables
		$envGhDebug = $Env:GH_DEBUG
		$envGhHost = $Env:GH_HOST
	}
	process {
		if ($PSBoundParameters['Debug']) {
			$Env:GH_DEBUG = 'api'
		}

		$Env:GH_HOST = $Hostname

		gh copilot explain $Prompt
	}
	clean {
		# Restore GH_* environment variables to their original value
		$Env:GH_DEBUG = $envGhDebug
		$Env:GH_HOST = $envGhHost
	}
}

Function GhCopilotSuggestShell {
    gh copilot suggest -t shell "$args"
}

Function GhCopilotSuggestPowerShell {
    gh copilot suggest -t shell "$args using Windows Powershell"
}

Function GhCopilotSuggestPowerShellCore {
    gh copilot suggest -t shell "$args using Powershell Core (pswh)"
}

Function GhCopilotSuggestGit {
    gh copilot suggest -t git "$args"
}

Function GhCopilotSuggestGitHub {
    gh copilot suggest -t gh "$args"
}

Function GhCopilotOops {
	gh copilot suggest -t shell "I am using Powershell Core (pswh) and I tried running the following command but it failed to do what I wanted or gave an error. Please correct any typos or errors. This is the command: $(Get-History -Count 2 | Select-Object -ExpandProperty CommandLine -Last 1)"
}

# By default use Powershell Core
Set-Alias ?? GhCopilotSuggestPowerShellCore

# Explicit calls for Powershell related stuff
Set-Alias pwsh? GhCopilotSuggestPowerShellCore
Set-Alias powershell? GhCopilotSuggestPowerShell

# Regular supported Copilot targets ("gh copilot suggest --help" for more info)
Set-Alias shell? GhCopilotSuggestShell
Set-Alias git? GhCopilotSuggestGit
Set-Alias gh? GhCopilotSuggestGitHub

# Register the oops command to fix a previous command (inspired by https://github.com/nvbn/thefuck)
Set-Alias oops GhCopilotOops