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I think there must be some tool to access clipboard form command line.
Some people has implemented this:
http://arminstraub.com/bits-and-bytes/k ... mmand-line
http://milianw.de/code-snippets/access- ... under-kde4
But I think these tools must be part of KDE, not third party tools. So that we can take advantage of both GUI and unix tools(such as sed, awk, etc.).

Let's see an example of me to show the powerful of these tools:
As a student, I often return from laboratory with some data on a paper. What I have to write a lab report. I think both the raw data and the chart ploted should be included in the report. Putting the raw data in a row in table will save space. But I have to plot some chart using QtiPlot, which require the data to be organized in column. Without these tools, I have to input these data in a row in Libreoffice Calc, paste these table to Writer, and repeatedly cut and paste to convert these data from row to column, and paste data in a column to QtiPlot. But with this tool, I can run the command "clip|sed 's/\t/\n/g'|clip -" instead of doing these tedious cutting and pasting.