Isn't there `xsel` or `xclip` installed instead [0]? These two commands are commonly used on the Linux boxes and they support pipes too. For example, the xclip is used by the original password-store implementation [1].
On [2] you might find the aliases to pbutil for X11-based Linuxes.
[0]: If not, why not run apt-get command to install one of them, like xclip?
