Just a suggestion, it's easy to capture command or program output with xsel, just by piping into it, for e.g.: 'ls | grep -i "whatever" | xsel -b'.

It is common for me and I have aliases set up for 'ls=ls -lah', g=grep -i' and 'x=xsel -b', so the actual commandline looks like 'ls | g "whatever" | x'. Then I can paste or redirect the result into something else.

There are probably better command line clipboard managers, but I just happened to settle on xsel, and it seems to work pretty well. That, and using alt and number keys to switch between tabs gets me pretty far with my terminal emulator.