EECS 1520 Lecture Notes - Lecture 7: File System Permissions, Railways Act 1921, File Allocation Table

• School: York University
• Department: Electrical Engineering and Computer Science
• Course: EECS 1520
• Professor: Steven Castellucci

Document Summary

Directories: reading (listing contents, writing (changing contents- adding, deleting, executing (accessing contents) Ever(cid:455) user of a (cid:272)o(cid:373)puter s(cid:455)ste(cid:373) is give(cid:374) a (cid:862)user(cid:863) a(cid:272)(cid:272)ou(cid:374)t: operating systems grant users to access files. A collection of related accounts can be combined into a (cid:862)group(cid:863) Permission to access files & directories can be granted based on users & groups. Windows: permission assigned or denied based on individual user & group entries, can specific permissions & grand a group has on files, permissions, modify, read & execute, read, write, list contents, change. Permission granted on the following: user (owner, group, other (everyone else) Permissions: read (r), write (w), execute (x) Dash is for file; d is for directory first character. Next characters are divided into triplets- first 3 is permission of users, then group & last 3 is other. Assign numeric values to each type of permission, permission can be set using 3 numbers instead.