xsel

X11 selection and clipboard manipulation tool.

• 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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