COMP 206 Study Guide - Final Guide: List Comprehension, Xmpp, Linked List
22 May 2016
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User space v. kernel space: user space a set of locations where normal user processes run (everything other than the kernel). Kernal"s job is to manage apps running in this space from messing w/ each other & the machine: kernal space the location where the code of the kernel is stored, Writing permissions: r w r x - - w x 1st 3 is user, 2nd 3 is group, final 3 is everyone else. Very 1st space is directory: [] [] [] repeated 3 times, 2^2 2^1 2^0, so if you wanted rwx r-x r-x you could write chmod 755 a. out. The shell: interactions bw programs (pipes, return codes, & io redirection) In unix, all input/out of a program happens through files. Both keyboard & terminal are virtual files: interactions with the user (command line, stdin, stdout) Stdin the file handle that your process reads to get info. Stdout your process writes normal info to this file handle.
