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usage: autossh [-V] [-M monitor_port[:echo_port]] [-f] [SSH_OPTIONS] -M specifies monitor port. Overrides the environment variable AUTOSSH_PORT. 0 turns monitoring loop off. Alternatively, a port for an echo service on the remote machine may be specified. (Normally port 7.) -f run in background (autossh handles this, and does not pass it to ssh.) -V print autossh version and exit. Environment variables are: AUTOSSH_GATETIME - how long must an ssh session be established before we decide it really was established (in seconds). Default is 30 seconds; use of -f flag sets this to 0. AUTOSSH_LOGFILE - file to log to (default is to use the syslog facility) AUTOSSH_LOGLEVEL - level of log verbosity AUTOSSH_MAXLIFETIME - set the maximum time to live (seconds) AUTOSSH_MAXSTART - max times to restart (default is no limit) AUTOSSH_MESSAGE - message to append to echo string (max 64 bytes) AUTOSSH_PATH - path to ssh if not default AUTOSSH_PIDFILE - write pid to this file AUTOSSH_POLL - how often to check the connection (seconds) AUTOSSH_FIRST_POLL - time before first connection check (seconds) AUTOSSH_PORT - port to use for monitor connection AUTOSSH_DEBUG - turn logging to maximum verbosity and log to stderr