Powershell–Comparing processes

This week I am teaching a PowerShell v2.0 class at Benchmark Learning.  During the class I usually show the following demo.

# Get the current running processes
$Baseline = Get-Process
# Create some new processes
Calc
Notepad
# Capture the current running processes
$Now = Get-Process
# Compare the two variables
Compare-Object $Baseline $Now

The students thought that was pretty cool, but wanted to know how to kill the processes that were not in the $Baseline variable.  Well, here you go…

# Get the current running processes
$Baseline = Get-Process
# Create some new processes
Calc
Notepad
# Capture the current running processes
$Now = Get-Process
# Compare the two variables
$Processes = Compare-Object $Baseline $Now
foreach ($i in $processes) {$i.inputObject | Stop-Process}

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