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Systemd automatic start for tmux
The first time tmux starts when '@continuum-boot' is set to 'on' tmux-continuum will generate a user level systemd unit file which it will save to ${HOME}/.config/systemd/user/tmux.service and enable it. From then on when that user logs in, either through a GUI session or on the console or via ssh, Systemd will start the tmux server.
The command used to start the tmux server is determined via the '@systemd_tmux_server_start_cmd' option that can be set in .tmux.conf. (Remember to reload your configuration with tmux source ~/.tmux.conf afterwards.
The default command to use is new-session -d. If you want more control over what sessions get started then you should set up your sessions in tmux.conf and set @systemd_tmux_server_start_cmd to 'start-server'
To control the tmux service you can use all the standard systemctl commands using the --user argument. eg to see if the tmux server has started:
systemctl --user status tmux.service