New User Orientation

1
New User Orientation

• What's with the sunlab?
• Fall, 2009
• Consultants
• (mostly lifted from Robert Mustacchi MTA Tech
  09-10, Andrew Brindamour, MTA Tech 08-09, parts
  stolen from Colin Gordon, MTA Tech 07-08, whose
  presentation shamlelessy built upon the work of
  Dave Pacheco, MTA Tech 06-07, who no doubt stole
  from Michael Shim, MTA Tech 05-06, and so on...)

2
Summary

• Getting started
• Filesystem
• Using shell commands
• File permissions
• Miscellaneous

3
Getting started

• Consultant Introduction
• What's my name?
• Why am I here?
• Where can you find me?
• Ok, getting started for real...

4
Getting started

• Open your envelope and log in with your
  credentials
• Follow the script to set up your passwords
• There's an option to get your mail forwarded to
  another address or you can check it with the mail
  program or at webmail.cs.brown.edu
• Check your cs email daily!

5
Getting started

• You're logged in!
• Open up...
• Firefox (Network gt Iceweasel Web Browser)
• Terminal (Accessories gt Terminal)
• Drag them to the menu bar at the top to create
  shortcuts

6
Summary

• Logging in
• Filesystem
• Using shell commands
• File permissions
• Miscellaneous

7
Filesystem

• Filesystem is a tree
• Unlike Windows, there are no drives - just one
  FS
• Paths are a sequence of directories to find a
  particular file, separated by '/'
• One directory is your working directory if your
  path doesn't start with '/', the path is relative
  to this directory
• Absolute path - /course/cs015
• Relative path mywork/project

8
Filesystem

• Change working directory with 'cd' command
• See current working directory with 'pwd'
• Also usually displayed in your prompt
• Special paths
• '.' current directory
• '..' one level up from current directory
• Example current directory is /course/cs017/bin
• Where will you be if you cd ./../handin/../././..
  ?
• Answer /course

9
Filesystem important places

• Home directory - /u/user/ user/ ( for you)
• Files/folders starting with '.' are hidden (not
  just in home)
• Most of your preferences are stored in these
  dotfiles in your home directory
• These files include .vimrc, .cshrc, .alias,
  .environment
• Course directory /course/csXXX/
• different for each course, but usually includes
  certain common folders such as asgn, handin, web,
  etc.
• IMPORTANT Don't confuse /course/csXXX with
  /course/csXXX! The first is your work for that
  course, the other is material for the course.

10
Summary

• Logging in
• Filesystem
• Using shell commands
• File permissions
• Miscellaneous

11
Using shell commands

• Usual syntax program options arguments
• e.g., grep -i -r lambda /course/cs017
• To find out about syntax and various options, use
  man commandname
• e.g., man grep
• This is your friend! Use frequently!

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Some useful shell commands

• man manual pages
• cd change directory
• ls list files in a directory
• pwd print working directory
• mv move files
• cp copy files

13
Summary

• Logging in
• Filesystem
• Using shell commands
• File permissions
• Miscellaneous

14
File permissions intro

• Each file and directory has permissions
• 3 classes of people, 3 permissions each
• owner, owning group, everybody else
• read, write, execute
• always described in that order
• ls -l shows permissions asrwxrwxrwx
  (everybody can r/w/x)rw-rw---- (owner and group
  can r/w)rw------- (owner can r/w)

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File permissions changing

• chmod - changes file permissions
• chmod args newmode files...
• most useful arg is -R recursive
• newmode can be numeric or symbolic
• chmod is a little tricky, so learn more by typing
  man chmod in your terminal

16
File permissions usage

• A student's work should not be world-readable
• Make sure /course does not have world-execute
• If you're having trouble opening a file, check
  the permissions!

17
Summary

• Logging in
• Filesystem
• Using shell commands
• File permissions
• Miscellaneous

18
Remote access

• Remote access lets you work from home (or other
  places with daylight)
• Come to the Remote Access Labs on Wednesday
  September 9th Tuesday September 15th at 4pm in
  the Sunlab

19
Resources

• Sunlab consultants (sit at 9a)
• problem_at_cs.brown.edu if you have problems with
  the departmental systems
• http//wiki.cs.brown.edu/Internal Wiki (lots of
  useful info)