According to the thread
Text Editors on Kobo -
https://www.mobileread.com/forums/sh...d.php?t=348359 - KOReader has a terminal emulator (see rtiangha's reply), I've never used it so I can't comment on it. You could try Vlasovsoft's "Konsole" though I doubt it will work on a Libra Colour, and as I pointed out in the above thread it's not a particularly good console.