Question
POSIX is an acronym for ?
Read the below passage and answer the questions Shell can be accessed by users using a command line interface. A special program called Terminal in Linux/macOS, or Command Prompt in Windows OS is provided to type in the human-readable commands A program which is responsible for providing an interface to a user so that he/she can access the shell. It basically allows users to enter commands and see the output of those commands in a text-based interface.  As a shell can also take commands as input from file, we can write these commands in a file and can execute them in shell to avoid this repetitive work. These files are called Shell Scripts or  Shell Programs . Shell script comprises the following elements – ·        Shell Keywords – if, else, break etc. ·        Shell commands – cd, ls, echo, pwd, touch etc. ·        Functions ·        Control flow – if..then..else, case and shell loops etc.Solution
POSIX is an acronym for “Portable Operating System Interface”. POSIX shell is based on the standard defined in Portable Operating System Interface (POSIX) – IEEE P1003.2. It is a set of standards codified by the IEEE and issued by ANSI and ISO. POSIX makes task of cross-platform software development easy. There are various POSIX versions, but the most important are POSIX.1 and POSIX.2, which define system calls and command-line interface.
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