After you have enabled anonymous links for SharePoint Online tenant, you can set what access level the links can give: edit or only view. The setting is global for the entire tenant. You can choose between

Edit - anonymous links will allow to edit documents

View - anonymous links will allow only to view documents

None - users can decide about the access level on per-document basis (no global setting)

The script is related to and more described in a Wiki article SharePoint Online Sharing settings with CSOM.

It requires SharePoint Online SDK.

How to use?

Download and open the .ps1 file.
Add correct libraries:

PowerShell

#Paths to SDK 
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll" 
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.Online.SharePoint.Client.Tenant.dll"

Enter the correct url and admin login:

PowerShell

Edit|Remove

#Enter the data
$AdminPassword=Read-Host -Prompt "Enter password" -AsSecureString
$username="admin@TENANT.onmicrosoft.com"
$Url="https://TENANT-admin.sharepoint.com"
$LinkType="View"  #Edit, View or None

#Enter the data 
$AdminPassword=Read-Host -Prompt "Enter password" -AsSecureString 
$username="admin@TENANT.onmicrosoft.com" 
$Url="https://TENANT-admin.sharepoint.com" 
$LinkType="View"  #Edit, View or None

Run the script