$ cat /usr/local/bin/c

#!/bin/sh
if test -n "$1"; then
	STDIN="${1}"
elif test ! -t 0; then
	STDIN=$(cat)
else
	echo 'Usage:'
	echo '	c < /path/to/file'
	echo '	c text-to-be-copied'
	echo '	command | c'
	exit 1
fi

qdbus org.kde.klipper /klipper setClipboardContents "$STDIN"

$ cat /usr/local/bin/v

#!/bin/sh
qdbus org.kde.klipper /klipper getClipboardContents

This is what I like to use :)