Adding – To add a solution to the Farm solution store use the Add-SPSolution:
Add-SPSolution –LiteralPath “C:\Deployment\MySharePointPackage.wsp”

Installing – To install a solution to the Farm solution store use the Install-SPSolution:
Install-SPSolution –Identity MySharePointPackage.wsp –WebApplication http://webapplication –GACDeployment

 Updating – To update a Farm solution use the Update-SPSolution:
Update-SPSolution –Identity MySharePointPackage.wsp –LiteralPath “C:\Deployment\MySharePointSolutionPackage.wsp” –GacDeployment

Removing – To uninstall and remove FARM level solutions use the Uninstall-SPSolution and Remove-SPSolution cmdlets:
Uninstall-SPSolution –Identity MySharePointPackage.wsp –WebApplication http://webapplication 

Remove-SPSolution –Identity MySharePointPackage.wsp

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