xsel — X11 selection and clipboard manipulation tool. More information: <https://manned.org/xsel>.

Use a command's output as input of the clipboard (equivalent to `<Ctrl c>`)

echo 123 | xsel {{[-ib|--input --clipboard]}}

Use the contents of a file as input of the clipboard

cat {{path/to/file}} | xsel {{[-ib|--input --clipboard]}}

Output the clipboard's contents into the terminal (equivalent to `<Ctrl v>`)

xsel {{[-ob|--output --clipboard]}}

Output the clipboard's contents into a file

xsel {{[-ob|--output --clipboard]}} > {{path/to/file}}

Clear the clipboard

xsel {{[-cb|--clear --clipboard]}}