Powershell commands to upload/download a page to sharepoint 2013

Upload file:

Add-PSSnapIn "Microsoft.SharePoint.Powershell" 
# Set the variables 
$WebURL = “http://your_sharepoint/your_site” 
$DocLibName = "Pages"
$FilePath = “C:\a.aspx” 

# Get a variable that points to the folder 
$Web = Get-SPWeb $WebURL 

$List = $Web.GetFolder($DocLibName) 
$Files = $List.Files 

# Get just the name of the file from the whole path 
$FileName = $FilePath.Substring($FilePath.LastIndexOf("\")+1) 

# Load the file into a variable 
$File= Get-ChildItem $FilePath

# Upload it to SharePoint 
$Files.Add($DocLibName +"/" + $FileName,$File.OpenRead(),$false) 

Download file (Html special characters will be escaped):

Add-PSSnapin Microsoft.Sharepoint.Powershell

$WebURL = “http://kmp21dev.emsd.hksarg/kmp21dev” 
$web = Get-SPWeb $WebURL
$file = $web.GetFile('pages/homepage.aspx');
$bytes = $file.OpenBinary();

[System.IO.File]::WriteAllBytes('c:\users\spadmin\homepage.aspx', $bytes);

read count : 10