SU Shell Terminal Emulator description

you can run commands even you don't have root at your phone.
you have two choices (two buttons) :
first button with $ symbol : you can run all Linux commands and save results to text file and return to the history to reduce writing , just click on the list-view of your history for run commands again .
second button with # symbol : you can run commands as root user , like that you can access to more folders and use more commands .