Deploying solutions in SharePoint 2013

Disable-SPFeature -Identity "Feature1" -Url "http://sharepointsite" -force

Uninstall-SPFeature -Identity "<Feature Name>" -force

OR

Uninstall-SPFeature -Identity "<Feature ID>" -force

Uninstall-SPSolution -Identity testsolution.wsp

Remove-SPSolution -Identity testsolution.wsp

Add-SPSolution -LiteralPath "C:\Packages\testsolution.wsp"

Install-SPSolution -Identity testsolution.wsp -GACDeployment -CompatibilityLevel {14,15}