Some handy Powershell Commands

AddSPSolution: http://technet.microsoft.com/en-us/library/ff607552.aspx  

Get-ChildItem: http://technet.microsoft.com/en-us/library/dd347686.aspx  

Import-Module http://technet.microsoft.com/en-us/library/dd819454.aspx  

Get-SPSolution http://technet.microsoft.com/en-us/library/ff607754.aspx  

Install-SPSolution http://technet.microsoft.com/en-us/library/ff607534.aspx  

Get-SPManagedAccount http://technet.microsoft.com/en-us/library/ff607835.aspx  

New-SPManagedAccount http://technet.microsoft.com/en-us/library/ff607831.aspx   

Disable-SPFeature  http://technet.microsoft.com/en-us/library/ff607879.aspx