Sets, deletes or changes the tag attached to a key. The first tag or
keyid names the key to be modified; the second, if present specifies the
new tag to be set. If no second argument is given, the existing tag, if
Sets, deletes or changes the tag attached to a key. The first tag or
keyid names the key to be modified; the second, if present specifies the
new tag to be set. If no second argument is given, the existing tag, if