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/

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 In another comment here I posted a link to a manual that wasn’t originally made public which predates 1st Edition by a few months.