Introduction to UNIX, part II

Description

Outline

1. Working with files and directories
   1. Start the secure shell client:
      Start->Programs->SSH Secure Shell->Secure Shell Client
   2. Connect to willow:
      From the secure shell window, click Quick Connect.
      Then, from the Connect to Remote Host pop-up window, enter:
      Hostname: willow.olemiss.edu
      User Name: student
      and click Connect.
      
   3. Creating, Editing and Viewing Files:
      Change directories to your numbered directory.
      willow> cat > memo
      Press the <Enter> key to start a new line.
      Now type in "remember emacs workshop Feb 9 "
      Press the <Enter> key to start a new line.
      Then type, "ask my committee for defense date ."
      Press the <Enter> key to start a new line.
      Enter Ctrl-d
      willow> ls
      willow> cat memo
      willow> echo use an editor for large files > tips
      willow> ls
      willow> cat tips
      willow> pico grocery_list
      Enter several lines of text
      Press the <Enter> key to accept the file name.
      Enter Ctrl-O to save (write Out) the file
      Enter Ctrl-X to eXit the pico editor
      willow> ls
      willow> cat grocery_list
      Edit the memo file as follows:
      willow> pico memo
      Add a new line of text:"pick up items from grocery"
      Enter Ctrl-O to save, the Ctrl-X to exit the editor.
      willow> cat memo
      willow> cat memo tips grocery_list
      willow> ls ../
      willow> cat ../goodfile
      willow> head ../goodfile
      willow> tail ../goodfile
      willow> head -15 ../goodfile
      willow> tail -15 ../goodfile
   4. Copying Files
      willow> cp memo memo.old
      willow> ls
      willow> cat memo
      willow> cat memo.old
      willow> cat memo.old memo
      willow> cp /users/student/goodfile .
      willow> ls
      willow> cat goodfile
      willow> cp goodfile badfile
      willow> cp grocery_list grocery_list_old
      Copy one of your classmates grocery lists into your directory. For instance, to copy student 1's list:
      willow> ls /users/student/1
      willow> cp /users/student/1/grocery_list grocery_list
      willow> ls
      willow> cat grocery_list
2. Managing your working environment
   5. Environment Variables:
      willow> env (to see the values of your environment variables)
      willow> echo $HOME (to print the value of your HOME variable)
      willow> echo HOME (to see what happens when you leave off $)
      willow> pwd (to print working directory)
      willow> cd $HOME (to change to your home directory)
      willow> echo $SHELL (to see which shell you are running)
      willow> setenv MYDIR /users/student/<numberwillow> (to create an environment variable to keep up with your numbered working directory)
      where <numberwillow> is your student number.
      e.g., if you are student #1, then
      willow> setenv MYDIR /users/student/1
      willow> echo $MYDIR to print the value of the new MYDIR envirnonment variable
      willow> pwd to print the current working directory
      willow> cd $MYDIR
      willow> pwd
      willow> echo $HOME
      willow> cd $HOME
      willow> echo $PATH
      willow> echo $MYDIR
      willow> setenv PATH ${PATH}:${MYDIR}
      willow> echo $PATH
   6. Environment Initialization Files
      willow> ls to list the files in the current directory
      willow> ls -l to list the files with long format
      willow> ls -a to list all files (even hidden dot files)
      willow> ls -al | more to list all files in long format, one page at a time
      willow> cat .login to view the environment initialization file that automatically executes each time you login under the csh
      willow> more .login to view the file one page at a time
      willow> cat .cshrc to view the environment initialization file
      willow> more .cshrc
3. Controlling access to your files and directories
   7. Practice viewing and setting the permissions on your files
      willow> cd $MYDIR
      willow> pwd
      willow> ls -l
      Who can read grocery_list?
      Who can overwrite/change/modify grocery_list?
      What is the group attribute of grocery_list?
      What is your current group?
      willow> chmod o-r grocery_list to remove read permissions for users other than yourself and those in the group
      willow> ls -l
      willow> chmod g-r grocery_list to remove read permissions for the group
      willow> ls -l
      
4. Sending and receiving electronic mail
   Demonstrate using pico to send and read email.
5. Editing text files
6. Managing jobs and processes
7. Writing shell scripts
   willow> cd $MYDIR (to change to your student numbered directory)
   willow> pwd
   willow> pico myscript
   Enter the two lines:
   ls
   ls -l
   Then Ctrl-O (to save) and Ctrl-X (to exit)
   willow> cat myscript
8. For More Information
   • UnixHelp