enable rtun only when using tmux

bashrc

@@ -381,7 +381,7 @@ mkcd(){
     cd $1
 }
 
-if null type reattach-to-user-namespace
+if test -n "$TMUX" && null type reattach-to-user-namespace
 then
     alias pbpaste="reattach-to-user-namespace pbpaste"
     alias pbcopy="reattach-to-user-namespace pbcopy"

emacs.el

@@ -609,6 +609,7 @@ otherwise the path where the library installed."
       t)
      (require 'pasteboard nil t)
      (turn-on-pasteboard)
+     (getenv "TMUX")
      (pasteboard-enable-rtun))
 
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