Running SharePoint 2010 Management Console.

To install a solution we use the Add-SPSolution command.  If you are using a Sandboxed solution you would use Add-SPUserSolution instead.

Add-SPSolution c:pathSharePointProject2.wsp

Solution added, now to deploy:

Install-SPSolution –Identity SharePointProject2.wsp –WebApplication http://sp2010 -GACDeployment

To upgrade the solution:

Update-SPSolution –Identity SharePointProject2.wsp –LiteralPath c:pathSharePointProject2.wsp –GACDeployment

And to uninstall solution:

Uninstall-SPSolution –Identity SharePointProject2.wsp –WebApplication http://sp2010
Remove-SPSolution –Identity SharePointProject2.wsp