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Week 2

Week 2. File Systems & Unix Commands. File System Hierarchy. File Names & Extensions. File Name: used so that the computer can easily remember the date within File Extensions: allow the operating system to know what application opens the file. File Manipulation. What is AFS?.

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Week 2

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  1. Week 2 File Systems & Unix Commands

  2. File System Hierarchy

  3. File Names & Extensions • File Name: used so that the computer can easily remember the date within • File Extensions: allow the operating system to know what application opens the file

  4. File Manipulation

  5. What is AFS? • AFS (Andrew File System): is a distributed file system which makes it possible for users to access information from any computer on a network • Security • Kerberos: used to authorize the user to the system • ACL (Access Control List): used to grant privileges to users for all directories on the network. • Volumes: To help in scalability, AFS uses volumes, a volume keeps a set of related files & directories together on a disk, which allows admins the ability to add and remove without us losing our data

  6. AFS File Tree

  7. Pathnames

  8. Relative Pathnames • ~/ : The ~/ references your home directory, this will be used as a shortcut to get us back to our home directories • .. : refers to the directory above the current working directory • . : refers to the current working directory

  9. Relative pathname practice • The path can be expressed • ../.elm/inbox • ~/.elm/inbox • ./../.elm/inbox

  10. Client/Server Relationship • Server: Is a powerful computer dedicated to managing, which sole task is to govern access to information and “serve” information requested by the client. • Client: Is a normal computer, or another server, that request the information from the server and relies on information from the server to complete its task • Who is the client and who is the server on NCSU network?

  11. SSH • Secure Shell: is a program that allows a computer to connect over a network and execute commands on a remote computer • It provides a secure and encrypted connection over an insecure network • Also protects networks from attacks such as IP spoofing, IP source routing, and DNS spoofing • Uses “tunneling” to group information together in secure SSH packets before sending it over a network

  12. Accessing AFS • Windows Students • Double click putty.exe icon on desktop • Click ‘Eos’ then ‘Load’ • Mac Students • Open ‘Terminal’ • Enter ‘ssh –X userID@remote-linux.eos.ncsu.edu’ • *replace userID with your UnityID

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