tpm/docs/installing_plugins_via_cmd_line.md

Installing plugins via the command line only

From inside tmux

When you have tmux running, plugins can be installed with the following command:

~/.tmux/plugins/tpm/scripts/install_plugins.sh

This is the equivalent of pressing prefix + I.

From outside tmux

To install the plugins when tmux is not even started (for example in a provisioning script):

# start tmux and create a session but don't attach to it
tmux new-session -d
# install the plugins
tmux run "~/.tmux/plugins/tpm/scripts/install_plugins.sh"
# killing the session is not required
tmux kill-session