 | | Again, things are different today. Although there are more versions of UNIX than ever, they all share, thanks to standards such as POSIX, ANSI C, and X/Open, a fairly common programming interface. Unfortunately, as someone once said, “the nice thing about standards is that there are so many to choose from.” Although most modern versions of UNIX are very similar, each vendor has added its own little twists, reintroducing the difficulties the standards were supposed to eliminate. The trick now, rather than describing how to do something on each version of UNIX, is to describe how to do it on a “standard” version of UNIX and then describe how to port code written on other versions to this standard version. That's what this book does. | |
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