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  • Peter Malmgren thinks this is interesting:

The Open Group released the Single UNIX Specification (SUS). SUS rapidly grew in popularity, in large part due to its cost (free) versus the high cost of the POSIX standard. Today, SUS incorporates the latest POSIX standard.


Cover of Linux System Programming, 2nd Edition


Somehow Mac OS X is a “UNIX” even though it has bizarre features such as case-insensitivity in it’s file system