### Environment variables
See https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-7.1 for more details. Tldr, use colons:
```plaintext
echo $Env:variable_name
cd $Env:userprofile # change to home dir
```

### Enable/disable devices
Sometimes, on one of my older laptops, the wifi card needs to be restarted.
```plaintext
Get-PnpDevice | where-object { $_.FriendlyName -eq "Intel(R) Dual Band Wireless-AC 7265" } | Disable-PnpDevice -Confirm:$false
sleep 1
Get-PnpDevice | where-object { $_.FriendlyName -eq "Intel(R) Dual Band Wireless-AC 7265" } | Enable-PnpDevice -Confirm:$false
```