Unix The Ultimate Guide 3rd Edition

It looks like Tim has heard me... Unix Power Tools, 3rd Edition

The first edition Unix Programmer's Manual dated defines the Unix time as "the time since 00:00:00, Jan. 1, 1971, measured in sixtieths of a second". Because of [the] limited range, the epoch was redefined more than once, before the rate was changed to 1 Hz and the epoch was set to its present value.

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 - what does '$?' mean in a shell script? - Stack Overflow

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unix - How can I pretty-print JSON in a shell script? - Stack Overflow

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