There's a wealth of clipboards you could be dealing with. I expect you're probably a Linux user who wants to put stuff in the X Windows primary clipboard. Usually, the clipboard you want to talk to has a utility that lets you talk to it.
In the case of X, there's
xclip (and others).
xclip -selection c will send data to the clipboard that works with
Ctrl + C ,
Ctrl + V in most applications.
If you're on Mac OS X, there's
cat example.txt | pbcopy
If you're in Linux terminal mode (no X) then look into
gpm or screen which has a clipboard. Try the
Under Windows 10+ or cygwin, use