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-ttdo? I haven't seen this in the manual page (man parallel-sshon Debian, Ubuntu). The-xoption provides SSH connection arguments. A single "string" of arguments to SSH can also be provided with-X.echo $PASSit will be visible for someone runningps aux. It is not a problem if you are the only user on this server.sttyconvolution with the following shortcut:echo -n Password:; read -s; echo "$REPLY". Or with bash it is only one command:read -s -p Password:; echo "$REPLY".