Android Terminal Emulator is an open source project. You can download Android Terminal Emulator tool from Google Play Store. With this app you can access your Android’s built-in Linux command line shell and unleash your inner geek. This app is not a game emulator. It won’t help you to root your phone or change your phone’s IMIE. To use this app you will be needing to know Linux command line. It is useful for accessing the Linux command line shell that is built into every Android system. It lets you run various Linux command line utilities.
[Also read: Android Shell Command Reference].
Other than this Android Terminal Emulator is useful for any ordinary phone, that hasn’t been rooted. You can access the entire /sdcard file system, install and run Linux command-line applications in the parts of the /data file system that are accessible to the Android Terminal Emulator process. Also you can run command-line programs that access the Internet.
You may want to install a set of command line utilities like “Busy Box” in order to add commands beyond the commands that come built into your Android device. The Linux Command Line takes you from your very first terminal keystrokes to writing full programs. A terminal emulator is a program that makes your Android phone act like an old fashioned computer terminal.
In-case you are having trouble entering text, try installing the free “Hacker’s Keyboard IME”.