I mentioned in my post on re­Struc­tured­Text that I use a little command-line tool, pbcopy, to pipe the output into the clipboard. I finally found a similar tool for Linux, xsel.

• Mac: pbcopy (UTF-8 aware, unlike the built-in version of pbcopy) copies its input to the pasteboard (Mac name for the clipboard); pbpaste writes the pasteboard to stdout.
• Linux: xsel gets and sets the X selection.
• Windows: winclip reads and writes the clipboard in a variety of formats. Use -m for UTF-8 text. The winclip binary is available as part of the outwit package.