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wl-copy is a command in the wl-clipboard package, and allows you to copy and paste data from your Linux Terminal on a Wayland desktop.
Copy an arbitrary string to your clipboard using wl-copy:
$ wl-copy "hello world"
Paste it anywhere on your system as usual (with Ctrl+Shift+V or a right-click and Paste).
You can copy from output, too:
$ echo "hello wide world" | wl-copy
You can redirect to wl-copy:
$ echo "hello world" > example.txt
$ wl-copy < example.txt
You can use wl-paste to paste from your system clipboard:
$ wl-paste
"hello world"