TLDR
Enter a command. For example: x0vncserver, toilet, diff3, apache2ctl.

xsel

 
X11 selection and clipboard manipulation tool. More information: https://manned.org/xsel.
 
  • Use a command's output as input of the clip[b]oard (equivalent to Ctrl + C):
     
    echo 123 | xsel -ib
     
  • Use the contents of a file as input of the clipboard:
     
    cat {{file}} | xsel -ib
     
  • Output the clipboard's contents into the terminal (equivalent to Ctrl + V):
     
    xsel -ob
     
  • Output the clipboard's contents into a file:
     
    xsel -ob > {{file}}
     
  • Clear the clipboard:
     
    xsel -cb
     
  • Output the X11 primary selection's contents into the terminal (equivalent to a mouse middle-click):
     
    xsel -op

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