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.
Capability maturity model integration (CMMI) is an approach or methodology for improving and refining the software development process within an organization. It is based on a process model or a structured collection of practices.
CMMI is used to guide the improvement process across a project, division or even an entire organizational structure. It also allows companies to integrate organizational functions that are traditionally separate, set goals for process improvements and priorities, provide guidance for quality processes, and act as a point of reference for appraising processes.
The first CMMI model was developed at the Software Engineering Institute (SEI) at Carnegie Mellon University. Its aim was to judge the maturity of an organization's software development processes. CMMI version 1.3 was released on November 1, 2010. It integrated all three CMMI models into one release. These include CMMI for Development, CMMI for Services and CMMI for Acquisition.
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