Support Key Only Mode
shotp help states that a key may be given:
$ shotp -h
shotp: usage: shotp OPTIONS [<key> [..]]
But doing so throws an error:
$ shotp LOHK6OH6AIBOHBEAHOHS
shotp: usage: shotp OPTIONS [<key> [..]]
Where options can be:
[...]
shotp: usage hint: must specifiy exactly one of: -X -I -Y
Just for testing it would be great, if this feature would work.