1. ENEE150 Discussion 01
Section 0101
Adam Wang

2. Overview Log into GLUE Create a simple hello world program
Compile it with gcc and submit

3. What is GLUE? Basically a network of computers owned by UMD
You will submit your assignments to it so we can look at them
Kind of like the cloud
You will log into it by SSHing into linux.glue.umd.edu
NOT glue.umd.edu

4. PuTTY SSH client SSH stands for Secure Shell
Basically lets you remotely login to the GLUE computers

5. Login to GLUE If you have a mac/linux just use terminal
Type “ssh linux.glue.umd.edu”
If you’re using windows download PuTTY if you haven’t
Linux.glue.umd.edu as the hostname and connect
Login using regular UMD credentials

6. Glue is a UNIX environment
Command-line interface, made around 1970s
“Dark room” environment
You basically ask the computer to show what you want

7. Basic UNIX commands

8. pwd
Print working directory
Used to show where you currently are

9. ls Displays all files and folders currently within your pwd
Use “ls –l” to display even more information

10. mkdir Creates a new directory
Make a folder called “ENEE150” in your home directory by typing “mkdir ENEE150”

11. cd
Change directory
We will navigate into the ENEE150 directory by typing “cd ENEE150”
If you hit tab the computer will try to autocomplete the file/folder name
You can go to parent directory by typing “cd ..”

12. emacs Basic text editor, like eclipse/notepad/etc.
You can use vi/any alternative
In the ENEE150 folder, type “emacs hello.c” to create/edit our first hello world program

13. Our first program Type Ctrl-x, Ctrl-s to save
Type Ctrl-x, Ctrl-c to close the window

14. Compile using GCC Gcc stands for GNU compiler collection
Basically transforms your code into an executable file
Type “gcc hello.c” to compile your program
This will create a file called a.out which can be executed
If you type “gcc hello.c –o hello.x” it will name the executable hello.x instead of a.out
Type a.out to run your program

15. Submit your file
The format is “submit year semester class class# section assignment# filename”
Type “submit 2017 fall enee hello.c” to submit your file to me
Submit under assignment #0 as a test
HWs will be assignment #1,2,3,…
Projects will be assignment #10,20,30,…
Submitting multiple times is ok, we will take the latest submission

16. Extra info

17. More UNIX commands Mv filename location “cut”
Cp filename location “copy & paste”
Rm name remove file
Rm –r name remove a folder

18. MobaXterm
I recommend this over puTTY
More features

19. Cygwin Portable Unix terminal for Windows
Lots of features & packages that come with it

20. WinSCP
You can make the program on your own computer, then copy it over to glue
Instead of writing your projects on glue

21. Final Words Make Backups Style is important Don’t Cheat
Coding is UNFAIR