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bind -t vi-copy ​'v'​ begin-selection​ bind -t vi-copy ​'y'​ copy-selection

From

Cover of tmux 2

Note

New syntax needed for 2.4 onwards:
bind-key -T copy-mode-vi 'v' send -X begin-selection
bind-key -T copy-mode-vi 'y' send -X copy-selection-and-cancel

https://sanctum.geek.nz/arabesque/vi-mode-in-tmux/