A, reference

Directory of Emacs series articles – Update ING

Copy text from Emacs to OS X clipboard

xclip

Second, problem description

With c-w (kill-region) and c-k (kill-line), you can only copy the clipped text to the cache inside Emacs, away from the current Emacs instance, and unusable, i.e. the clipped text in Emacs is incompatible with the system’s clipboard

Three, use,xclip

2.1 installation

M-x package-install RET xclip RET

2.2 Basic use

Use c-w, c-k to clip and paste the text to the clipboard of the system, and then copy the text in other applications