i have been using the same config for a long time

bind-key -t vi-copy 'v' begin-selection

Recently I upgraded to Ubuntu 18.04 LTS. I start to receive this kind of error:

/home/user/.tmux.conf:13: usage: bind-key [-cnr] [-T key-table] key command [arguments]

Have you ever run into the same kind of problem?

tmux -V
tmux 2.6

1 Answer 1


The syntax has changed, and now requires send-keys, so:

bind-key -T copy-mode-vi 'v' send-keys -X begin-selection
bind-key -T copy-mode-vi 'y' send-keys -X copy-selection

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