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The thing I like the most about it: appendix A has a "detailed" description of each syscall. Is there something nearly as good as this for subsequent UNIX versions? Suppose someone plans to implement a clone of V5 or ealier UNIX, where can the list of syscalls be found?

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Just search for the manual of any edition of UNIX you want online. You can probably find it.

Here’s 5th Edition’s on the Internet Archive: https://archive.org/details/unix-v5/mode/2up

Go to section 2 for the system calls.

In another comment here I posted a link to a manual that wasn’t originally made public which predates 1st Edition by a few months.

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