Just a couple of nice tools that I have found for android. One is Lil' Debi, which is a Debian chroot for android, with the 'sdcard' (on the Nexus, /mnt/sdcard roughly translates into a busy home directory) mounted for easy access. I had a small hiccough with apt-get, although the fix was easy enough: source /etc/profile. See: http://tinyurl.com/o7q2uqp
The other is Terminal IDE, which I have yet to try out (I need to transcode some files to make space, first), but it comes with a nice keyboard, compatible with Hacker's Keyboard, although it has its own strengths and weaknesses.
Lil' Debi is available on F-Droid. Both are available on Google play. Both require that you root your phone.