Why do I get "mysql: unknown option '-▒'" error on execution of mysql command performing any query?

Question

On the execution of the following command in linux

mysql --host=HOST --user=USER -–password='password' DATABASE --execute='SHOW TABLES'

I get the following error

mysql: unknown option '-▒'

This output does not depend on execute command and it is same for any password whether it is correct or wrong. This is on shared hosting. Please advise what can I do about it?