Powershell – Measure Historical Command

Have you ever been working in a Powershell console and have a command run longer than expected? Did you wish that you had wrapped that command in a Measure-Command so that you could view execution time? This has happened to me several times, so recently I started working on a Measure-HistoricalCommand function that would use Get-History to create a New-TimeSpan from the StartExecutionTime and EndExecutionTime properties. I would like to say thanks to @mtboren from vnugglets.com who helped add some functionality and speed up this function.

[cc lang=”powershell”]
Function Measure-HistoricalCommand {
## for getting info about the last X commands
## for getting info about a specific command ID
) ## end param

process {
## create the Get-History command expression to invoke; use -Id or -Count based on the params passed to this function
$strGetHistoryExpr = “Get-History ” + $(if ($CommandID) {“-Id $CommandID”} else {“-Count $Last”})
Invoke-Expression $strGetHistoryExpr | %{
$ts = New-TimeSpan -Start $_.StartExecutionTime -End $_.EndExecutionTime
## again, take out the array, just return the object straight away
#$myResults += New-Object PSObject -Property @{
New-Object -TypeName PSObject -Property @{
ID = $_.ID
CommandLine = $_.CommandLIne
EndExectuionTime = $_.EndExecutionTime
StartExecutionTime = $_.StartExecutionTime
TimeSpan = $ts
TotalSec = $ts.TotalSeconds
} ## end new-psobject
} ## end History foreach-object
} ## end process
} ## end fn

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