Sharepoint 2010 Grant Permission to a Group using Powershell

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Sometimes we need to grant permission to a particular group. There are different different permission levels in sharepoint. Below are some examples:
Design, Contribute, Read, View Only

For allow group of user as per mentioned permission level here is a powershell script. I think this will be very helpful for grant permissions.

clear  
Remove-PSSnapin Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue  
Add-PSSnapin Microsoft.SharePoint.Powershell 

 $Url = "Sitecollection/Site Url on which we need to grant permissions"

 $GroupName = "All Authenticated Users"   #Group Name
$PermissionLevel = "Full Control"  # Permission Level
$Description = "This group contains all authenticated users."              
$web = Get-SPWeb -Identity $Url
if ($web.SiteGroups[$GroupName] -ne $null)
{
Write-Host "Group $GroupName already exists!" -foregroundcolor Red
}
else
{
$web.SiteGroups.Add($GroupName, $web.Site.Owner, $web.Site.Owner, $Description)
$group = $web.SiteGroups[$GroupName]
$roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($group)
$roleDefinition = $web.Site.RootWeb.RoleDefinitions[$PermissionLevel]
$roleAssignment.RoleDefinitionBindings.Add($roleDefinition)
$web.RoleAssignments.Add($roleAssignment)
$web.Update()
Write-Host "Group $GroupName created successfully" -foregroundcolor Green
}

 $user = "c:0(.s|true"
# $web.SiteGroups[$GroupName].AddUser($user, "", "","")               
Set-SPUser -Identity $user -web $Url -Group $GroupName 
$web.Dispose()
  

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