Hi @stevenfalco. Thanks for raising this. It looks like I goofed and an old version of the file made its way into the book.

It’s supposed to use @ variables, not the commands themselves.

Does this work for you?

# Detect the display server protocol and set clipboard commands
if-shell '[ "$XDG_SESSION_TYPE" = "wayland" ]' \
    'set -g @copy_command "wl-copy"; \
     set -g @paste_command "wl-paste -n"' \
    'set -g @copy_command "xclip -sel clip -i"; \
     set -g @paste_command "xclip -sel clip -o"'

# Prefix Ctrl-C takes what's in the buffer and sends it to system clipboard
# via the command stored in the variable.
bind C-c run-shell 'tmux save-buffer - | #{@copy_command}'

# y in copy mode takes selection and sends it to system clipboard via the
# command stored in the variable.
bind -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "#{@copy_command}"

# Prefix Ctrl-v fills tmux buffer from system clipboard, then
# pastes from buffer into tmux window
bind C-v run-shell '#{@paste_command} | tmux load-buffer - \; paste-buffer'