To delete one of them:
@example
-$ echo example.com > fifos/del-tls-auth
+$ echo example.com >fifos/del-tls-auth
@end example
To preadd:
@example
-$ echo example.com path/to/client.cert.pem > fifos/add-tls-auth
+$ echo example.com path/to/client.cert.pem >fifos/add-tls-auth
@end example