CMSC212 Discussion

1
CMSC212 Discussion

• Wednesday, January 26, 2005
• Sections 010X

2
Information

• Name Konstantin Berlin
• Email kberlin_at_cs.umd.edu
• Office Hours Mo 1130-1230pm, W 1130-130pm,
  400-500pm in room AV Williams room 1112
• Additional Hours By appointment only. Talk to me
  first.
• Slides www.cs.umd.edu/kberlin/spring2005
• Free software www.sourceforge.net
• May change

3
Outline

• Announcements
• Using Unix
• Installing programming environment in Windows.
• Demo

4
Announcements

• Lab Monday will either be in CSI2118 or in
  AVW1120
• This depends if we get remote logins into Linux
  wam accounts working
• Make sure you find out before Monday
• Attendance
• We will cover new material in discussion. Be
  careful what you skip.
• As long as there enough laptops I dont care
  which section you attend. Except for quiz days.
• Questions
• Please ask questions
• If Im not answering your question, dont be
  afraid to interrupt me and ask again.

5
Accounts Setup

• Log into grades.cs.umd.edu
• Get two accounts
• jh212xxx WAM account
• cs212xxx CVS account
• How to SSH Check later slides
• Change password
• SSH into linuxlab.cs.umd.edu
• type passwd to change password
• SSH into wam.umd.edu
• type passwd to change password
• Note This is not a LINUX machine. Do NOT assume
  project compiled there will work when submitted.
• new!In wam.umd.edu
• type emacs .cshrc.mine
• add three lines
• setenv CVSROOT /homes/jh212001/cvs/user set
  path(hollings/bin path) setenv CVSEDITOR
  "/usr/local/bin/emacs -nw"
• press ctrl-x, ctrl-c, y, enter to exit
• re-login

6
Using your account Unix

• Getting help
• man displays help for
• Loging out
• logout log out of wam
• Making directories
• mkdir to create a directory.
• Checking current directory
• pwd displays current directory
• Copying/Deleting/Moving files or directores
• cp to copy of files to directory.
• rm r to delete
  recursively
• mv to
  move to
  
• Check your environment
• uname a displays current operating system
  (make sure its linux)
• env displays your enviroment settings

7
Using Your Account CVS

• Now use command line interface with CVS
• Help and list of options
• man cvs
• Get files first time
• cvs checkout
• Update from cvs
• cvs update
• Add files to cvs
• cvs add
• Commit changes to cvs
• cvs commit
• Remove file from cvs
• cvs remove
• For better understanding of command line
  interface check out the tutorials, manual page
  for cvs.
• The other option is to use Eclipse ?

8
Using Your Account Compiling and Running

• Our compiler is gcc
• Compiler errors make less sense then with javac
• gcc o .c
• compiles and links the program
• gcc v
• gives compiler version
• We will use makefiles
• Covered in later discussion
• Our debugger
• An error in program will cause program to crash.
  There will not be a stack trace printed like in
  JAVA.
• Need to use a debugger to get an idea of where
  the problem occurred
• Covered in later discussion

9
Using your account Editing

• To view files use one of these
• less
• more
• cat
• To edit files use one of these
• pico
• emacs
• See tutorial on class webpage for more details
• Input redirection
• command output file
  name
• Comparing files
• type diff bwi .
  Warning -bwi options dont ignore extra blank
  lines.

10
Windows SSHSCP

• SSH
• Secure version of telnet.
• Putty
• www.chiark.greenend.org.uk/sgtatham/putty
• SCP
• Secure version of ftp.
• winscp
• winscp.sourceforge.net/eng/
• filezilla
• http//sourceforge.net/projects/filezilla/

11
Alternative Ways

• If you have a windows machine and want to work
  from home please install Linux as a duel boot.
• Any windows alternatives will most likely NOT
  work for successive projects.