I do a lot of system administration with my thumbs. Yes, if I’m
home, I grab a laptop or go to my office and type in a real terminal
window. Usually, when things go wrong though, I’m at my daughters’ volleyball
match or shopping with my wife. Thankfully, most tasks can be done
remotely via SSH. There are lots of SSH clients for Android, but my
favorite is JuiceSSH.
Android Candy: Landing on the Moon, with your Thumbs
Source: Linux Journal