Feature Activation with Powershell

Question

I am looking for a good example of powershell script for SP2010 with which I could activate my features with prior check if feature has been deployed (some are "web" and some are "site" scoped. Could you please guide me or provide some samples.

Answer 1

A really good explanation is already been given on this blog, so I would suggest you to look at it

features-with-powershell/

Possibly Duplicate Question

EDIT

detect if a feature is deployed or not

detecting-solution-deploying-status

Edit 2

Code of checking if a feature is activated or not

PS C:\Users\omlin> $featureGuid = "PUT-GUID-HERE"
PS C:\Users\omlin> $web = Get-SPWeb http://localhost
PS C:\Users\omlin> $feature = $web.Features[$featureGuid]
PS C:\Users\omlin> if ($feature -eq $null) { "does not activated" } else { "activated" }
does not activated
PS C:\Users\omlin>

Answer 2

Powershell script to check whether SharePoint 2010 Feature is activated for a particular Sitecollection

http://social.technet.microsoft.com/Forums/en-GB/sharepoint2010setup/thread/fa74e065-9fa6-4c8c-8ea7-18899b11d066

SharePoint 2010 Deployment: Powershell Script Feature

http://ranaictiu-technicalblog.blogspot.co.uk/2010/05/sharepoint-2010-deployment-powershell.html