en-us/Patching_With_Patchy.walkthru.help.txt

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Managing patches can be a pain. That's why Patchy exists. To find out all of the pending patches on a machine, use:
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Find-WindowsUpdate
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To find all of the installed patches, use Get-InstalledUpdate
 
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Get-InstalledUpdate
 
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To find just the KB Numbers, use, Get-InstalledKBNumber
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Get-InstalledKBNumber
 
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Microsoft sometimes issues "Hidden" updates. This lets you find them.
 
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Find-WindowsUpdate -Hidden
 
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This will install all patches. As you can see. Patchy makes patching much less painful.
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Find-WindowsUpdate |
    Install-WindowsUpdate