The UNIX® Standard | www. opengroup. org The success of the UNIX approach led to a large number of “look-alike” operating systems, often divergent in compatibility and interoperability To address this, vendors and users joined together in the 1980s to create the POSIX® standard and later the Single UNIX Specification Formal UNIX certification started in 1995, with all the major UNIX vendors certifying their products Most
What does the line #! bin sh mean in a UNIX shell script? When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file These form the so-called "magic number", which can be used to decide the format of the program and how to execute it
scripting - What does $$ mean in the shell? - Stack Overflow Every process in a UNIX like operating system has a (temporarily) unique identifier, the PID No two processes running at the same time can have the same PID, and $$ refers to the PID of the bash instance running the script This is very much not a unique idenifier in the sense that it will never be reused (indeed, PIDs are reused constantly) What it does give you is a number such that, if
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UNIX® Systems | www. opengroup. org UNIX System Test Suites -- Technical Data Sheet Executive Summary The Open Group has expanded it's range of test suites for the Single UNIX Specification and the associated UNIX certification program This is an opportunity for leading UNIX system suppliers suppliers to acquire state-of-the-art test tools to ensure the development of conformant UNIX® System products and to demonstrate their