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The UNIX® Standard | www. opengroup. org Single UNIX Specification- “The Standard” The Single UNIX Specification is the standard in which the core interfaces of a UNIX OS are measured The UNIX standard includes a rich feature set, and its core volumes are simultaneously the IEEE Portable Operating System Interface (POSIX) standard and the ISO IEC 9945 standard
unix - Why is 1 1 1970 the epoch time? - Stack Overflow The definition of unix time and the epoch date went through a couple of changes before stabilizing on what it is now But it does not say why exactly 1 1 1970 was chosen in the end
www. opengroup. org About Us The Open Group is a global consortium that enables the achievement of business objectives through technology standards and open source initiatives by fostering a culture of collaboration, inclusivity, and mutual respect among our diverse group of 900+ memberships Our Membership includes customers, systems and solutions suppliers, tool vendors, integrators, academics, and consultants
bash - Shell equality operators (=, ==, -eq) - Stack Overflow = and == are for string comparisons -eq is for numeric comparisons -eq is in the same family as -lt, -le, -gt, -ge, and -ne == is specific to bash (not present in sh (Bourne shell), ) Using POSIX = is preferred for compatibility In bash the two are equivalent, and in sh = is the only one that will work