Preserve/save PowerShell command history globally, across sessions.

preserve_history.ps1

# The full path at which to save the history file.
$history_file = "~\PowerShell\history.csv"

# The amount of history to save.
$history_size = 32KB

# Create the ~\PowerShell directory if is does not already exist.
if (!(Test-Path ~\PowerShell -PathType Container)) {
	New-Item ~\PowerShell -ItemType Directory
}

# Load back the global history into the session history
if (Test-Path $history_file) {
	Import-CSV $history_file | Add-History
}

# Register an event to automatically save history on exit.
Register-EngineEvent PowerShell.Exiting -SupportEvent -Action {
	Get-History -Count $history_size | Export-CSV $history_file
}

Credit to:

• PowerShell Team: https://devblogs.microsoft.com/powershell/perserving-command-history-across-sessions/
• Shaun Luttin on StackOverflow: https://stackoverflow.com/a/31119208/4997194

Wow... awesome.. copying this right now...
Thanks
Russ