Command line utility to put stdin into the X 'current selection'clipboard

[Crispin Wellington]

Is there a shell utility that can take stdin and put it into an X
clipboard. The 'current selection' clipboard would be ideal, but any of
the X Clipboard's would suffice. For example

ls | someutility

and then middle mouse click (or ctrl-v) somewhere else to paste the
text?

Thanks
Crispin Wellington

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