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" External command '!tmux' and its parameters are wrapped in :execute so it is run properly
" -t 0.1 is the tmux session and window name, this needs to be changed to whatever session/window you want to send it to
" | is used to run the :redraw! command after code is executed, since vim's buffer graphically glitches and needs to be redrawn

:execute  "silent !tmux send -t 0.1 'ruby test.rb' Enter" | :redraw!