Copying and Pasting with tmux 2.4+

.tmux-osx.conf

# Unbind from non-macOS setup
unbind-key -T copy-mode-vi 'y'
# Copy now goes to macOS clipboard
bind-key -T copy-mode-vi 'y' send -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy"

.tmux.conf

set-window-option -g mode-keys vi

# vi-style copying
bind-key -T copy-mode-vi 'v' send -X begin-selection
bind-key -T copy-mode-vi 'y' send -X copy-selection-and-cancel

# Import macOS-only config
if-shell 'test "$(uname -s)" = Darwin' 'source-file ~/.tmux-osx.conf'

1.8-tmux.conf

# Old 1.8 version:
bind-key -t vi-copy 'v' begin-selection
bind-key -t vi-copy 'y' copy-pipe "reattach-to-user-namespace pbcopy"

2.4-tmux.conf

# New 2.4 version:
bind-key -T copy-mode-vi 'v' send -X begin-selection
bind-key -T copy-mode-vi 'y' send -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy"

emacs-tmux.conf

bind-key -T copy-mode 'Enter' send -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy"

install

brew install reattach-to-user-namespace

reattach-to-user-namespace

set-option -g default-command "reattach-to-user-namespace -l bash"