A shell variable is a variable that is available only to the current shell. In contrast, an environment variable is available system wide and can be used by other applications on the system.A shell is the operating system's command interpreter. It processes the commands entered on the command line or read from a shell script file.
An Android device is a device that runs on the Android operating system. Android is an array of software intended for mobile devices that features an operating system, core applications and middleware. An Android device may be a smartphone, tablet PC, e-book reader or any type of mobile device that requires an OS.
Android is developed by the Open Handset Alliance, which is led by Google. Some of the well-known Android device manufacturers include Acer, HTC, Samsung, LG, Sony Ericsson and Motorola.
Popular Android devices include smartphones, tablets and e-readers. The Android OS is also built into a limited number of other devices, such as netbooks, portable music players, the Binatone iHome Phone and Odroid handheld game consoles.
Android device developers and programmers can find information at the Android website, which offers an Android software development kit.
Within a short period, the Android platform became so popular that it surpassed Windows Mobile and Symbian for a number of applications. Various mobile device manufacturers embraced the Android platform due to its overwhelming popularity. The reasons behind this success are as follows:
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