Nice tmux copy and paste using OS X clipboard

.tmux.conf

# =======================================================================
# vim-style copy and paste
setw -g mode-keys vi
bind ] paste-buffer
bind-key -t vi-copy 'v' begin-selection
bind-key -t vi-copy 'y' copy-pipe "reattach-to-user-namespace pbcopy"
bind-key -t vi-copy  Space rectangle-toggle

# Update default binding of `Enter` to also use copy-pipe
unbind -t vi-copy Enter
bind-key -t vi-copy Enter copy-pipe "reattach-to-user-namespace pbcopy"
# =======================================================================

README.md

Be sure to first run:

brew install reattach-to-user-namespace