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.
Facebook is a free social networking Web platform that promotes and facilitates interaction between friends, family and colleagues. Facebook was founded in 2004 by Mark Zuckerberg and several Harvard University classmates.
Facebook features include:
Facebook’s developer network facilitates advanced functionalities via applications. Facebook Connect is a login authentication service that enables cross-platform and customizeable Web interaction.
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