autossh:tldr:74784

The command "autossh" is a utility that automatically restarts SSH (Secure Shell) sessions and keeps them running even if the network connection is intermittent or drops.

Here is the breakdown of the command:

• "autossh": This is the command itself, invoking the autossh utility.
• "-f": This option runs autossh in the background as a daemon.
• "-M ${monitor_port}": This option sets up a monitoring port. The "${monitor_port}" is a placeholder for the actual port number you will specify.
• "-N": This option tells SSH to not execute any remote command after connecting. It is often used for port forwarding or when only a secure tunnel is required without executing any remote commands.
• "${ssh_command}": This is a placeholder for the actual SSH command that you want autossh to establish and maintain a connection for. It could be something like "ssh username@hostname" or any other SSH command that you normally use for connecting to a remote server.

In summary, the given command uses autossh to establish and maintain an SSH connection using the provided "${ssh_command}". With the "-f" option, it runs in the background, and the "-M" option sets up a monitoring port for autossh to detect if the SSH connection drops and automatically restart it.