$authorID
Returns message's author ID.
Usage
$authorID
Example
$nomention
This command was written by <@$authorID>!
Explanation
Discord uses this format: <@USER_ID> to mention user. For example, let's say that $authorID is equal to 246604909451935745.
If we use this: <@$authorID>, it will be replaced with <@246604909451935745> and discord will interpret this as a mention (@Noituri).