I use a KDE variant of this that uses klipper instead (whatever you pipe to this will be available in klipper):

` #!/bin/sh

function copy {
    if ! tty -s && stdin=$(</dev/stdin) && [[ "$stdin" ]]; then
        stdin=$stdin$(cat)
        qdbus6 org.kde.klipper /klipper setClipboardContents "$stdin"
        exit
    fi

    qdbus6 org.kde.klipper /klipper getClipboardContents
}

copy $@`