Random file access

I’ve not seen much code with core functions relating to files open and used in random access mode. I’ve seen a couple commands (but I’ve forgotten the details) that appear to be like C’s seek() and lseek() and such like. Is there a convenient white paper or tutorial that goes into more detail about such functions?
I’m particularly interested in Julia’s power in b+trees creation, building, updating and etc.

The reference docs for most of those functions should be on I/O and Network · The Julia Language (link goes to seek). I’m don’t know of any tutorial material on this off the top of my head, but you may be able to glean something from Networking and Streams · The Julia Language.

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