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how to do install tmux plugins

# Install tmux plugins manager
git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm

# Put this at the bottom of ~/.tmux.conf ($XDG_CONFIG_HOME/tmux/tmux.conf works too):
# List of plugins
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'

# Other examples:
# set -g @plugin 'github_username/plugin_name'
# set -g @plugin 'github_username/plugin_name#branch'
# set -g @plugin 'git@github.com:user/plugin'
# set -g @plugin 'git@bitbucket.com:user/plugin'

# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run '~/.tmux/plugins/tpm/tpm'

# type this in terminal if tmux is already running
tmux source ~/.tmux.conf

how to do install tmux plugins

Press prefix + I (capital i, as in Install) to fetch the plugins