If the corresponding service is not running then it is initiated and the connection is attempted again. If command is specified then it is executed with the standard input, standard output and standard error redirected to the path connect stream. If name is - then all attributes are listed. If path is omitted then the standard input is read. Set the debug trace level to level .
Higher levels produce more output.
This is useful for .profile initialization. The service is initiated if it is not already running. If host is omitted then the standard input is read for host names, one per line. Each line in the local file provides information for a single host. Attributes for the host local are inherited by all hosts.