CS CS Tutorial 2 2 Winter 2018
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1 CS CS Tutorial 2 2 Winter 2018 Sections 1. Unix Basics and connecting to CS environment 2. MIPS Introduction & CS230 Interface 3. Connecting Remotely If you haven t set up a CS environment password, please do so here: Unix Basics 1.1 Use the lab computer or a OSX device for now. Open a terminal window on your desktop by opening the search bar and typing in: Terminal and clicking the program. If the search takes too long, click the Desktop background. In the active Finder toolbar, click Go - > Utilities, and then open Terminal.app. This is the UNIX command line. 1.2 Connect to the CS environment by opening an SSH session: ssh username@linux.student.cs.uwaterloo.ca 1.3 Check to see that you are running the bash shell by executing echo $SHELL. If the result is not /xhbin/bash or bin/bash, execute bash by typing: bash and hitting enter. Note that one of the advantages of the bash shell is that you can easily scroll through previous commands by using the arrow keys. 1.4 Become familiar with some of these commands to navigate the command line. (Follow instructor tutorial)
2 Command Description pwd Shows the current working directory. ls Lists the contents of current directory. cd dirname Change current directory path to <dirname>. E.g. cd cs230 cd.. Change from current directory to parent directory mkdir dirname Create a new directory rmdir dirname Removes the directory cp file2 file1 Copy a file mv file1 newname Move or rename a file rm file1 [file2 ] Remove or delete a file rm r dir1 [dir2 ] Recursively remove a directory and its contents. BE CAREFUL with this command. more filename Display contents of a file one page at at ime cat filename Dump a file to the screen in ASCII emacs filename Edit a file using emacs editor. Not all systems will have it. Refer to the web for more detailed usage. vim filename Edit a file using vim editor. Not all systems will have it. Refer to the web for more detailed usage nano filename Edit a file using nano editor. Not all systems will have it. Refer to the web for more detailed usage chmod permissions filename Change permission of a file or directory. e.g. chmod 555 test.asm > filename Redirects standard output to filename >& filename Redirects standard output and standard error to filename < filename Redirects standard input from filename Pipes output from one source as input to another.
3 2.0 MIPS Introduction & CS230 Interface 2.1 Make sure you are in your CS230 directory. Now create an assembly file by using the following command: nano add.asm 2.2 Input the following into the editor: ; This program adds integers in register $1 and $2, and stores ; result in $3. add $3, $1, $2 jr $ Save and quit (Ctrl- o and hit enter, and then Ctrl- X) the editor. Follow Step #2 of the MIPS Instructions to assemble your program. After executing the command, you should see a file called add.mips in your current directory. 2.4 Follow Step #3 of the MIPS instructions to run your program. (Use the twoints program). Check the output carefully and make sure you know what it means. 2.5 Now transfer the file you have created on the CS environment (add.asm) to your local computer. Follow Section if you are using OSX / Linux, or Section if you are using Windows. 3.0 Connecting Remotely 3.1 Connecting from Mac OSX / Unix If you are on the network, accessing the command line and using the student environment is the same as 1.0.
4 3.1.1 Upload/download file and directory through SSH (Mac/Unix) If you are currently connected to the student environment, disconnect from it by typing: exit, if you are in Bash, you may have to enter it twice. You want to receive this message: Connection to linux.student.cs.uwaterloo.ca closed. Now lets try downloading a file to the your local computer. Here are some helpful commands: Upload command (copy file to host): scp SourceFile user@hostname:directory/targetfile Download command (copy file from host): scp user@hostname:directory/sourcefile TargetFile Lets try copying add.asm from the remote CS server onto your local computer. This is helpful when you need to upload an.asm file you have created on the CS environment onto Markus. scp youruw_id@linux.student.cs.uwaterloo.ca:~/cs230/add.asm add.asm You can use the pwd command to check where you are, and the ls command to check whether the file you uploaded/downloaded is in the current folder Upload/download files by mounting a drive (Mac/Unix) If you want a little more convenience (drag an drop, edit.asm files using a GUI such as Sublime Text), you can mount your CS environment onto your local computer. If you are not connected to the school network (e.g. eduroam), then you will have to VPN into the school s network by following the instructions on this website: systems- technology/services/virtual- private- network- vpn/about- virtual- private- network- vpn - using- the- vpn
5 In order to mount the CS drive, click the Desktop and you will see Finder as the active toolbar. Click Go - > Connect to Server. Under server address enter: smb://smb- files.student.cs.uwaterloo.ca/youruw_id Use the same credentials for your CS environment if it asks. Once mounted, the drive should show up in a Finder window under the Shared section. You are now able to edit files and upload directly from the CS environment. 3.2 Connecting from Windows PuTTY ( is a free implementation of Telnet and SSH for Windows and Unix platforms. You can use PuTTY to login to the linux.student server. Please download PuTTY first. After download is finished, open it. And
6 input the information as shown below. Use your studentid as your login and your CS environment password as your password. Now hit open to start a SSH connection. If it asks about storing the key in cache you can say No Upload/download file and directory through SSH (Windows) The SCP command on Windows does not work that great. It is best to use a client such as WinSCP to do file transfers to and from the student
7 environment. You can download it here: Once you ve installed WinSCP and launched the program. You will be greeted with a Login window. Enter the correct hostname (seen in picture) and your username and password and hit login. If it asks about storing the key in cache you can say No. You can now drag and drop files between your local system and the student environment using this program.
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