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Caret notation usually represents characters, not key presses. They represent the 33 control characters in the ASCII character set. Only the following control characters exist: ^@, ^A through ^Z, ^[, ^\, ^], ^^ and ^_, plus ^?. The correspondence between control characters and their notation is that ^char is the character whose encoding is 64 less than ...


Most important things POSIX 7 defines C API Extends ANSI C with things like: networking, process and thread management, file IO, regular expressions, ... E.g.: write, open, read, ... Those APIs also determine underlying system concepts on which they depend. Many Linux system calls exist to implement a specific POSIX C API function and make Linux ...

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