lab-report-1-week-2.md

Introduction

This is the tutorial about how to log into a course-specific account on ieng6 for incoming 15L students. There are a total of 6 steps in this tutorial and it would only take about 30 minutes to complete.

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1. Installing VScode (~2 minutes)

1. Go to the Visual Studio Code website, and follow the instruction to download and install it to your computer
2. When it is successfully installed, you should be able to open a window that looks like this

• The window might have different colors, or a different menu bar, depending on your system and setting

2. Remotely Connecting (~10 minutes)

1. Install OpenSSH with this tutorial

• Since I am using a Windows laptop, the tutorial I will be demonstrating is all Windows version. Mac users have to stick to their version of tutorial.
• Follow these particular steps in listed in the picture

2. Look up your course-specific account for CSE15L here

• After typing your username and ID into the box, you will see the following page
• You will see your couse-specific account under additional accounts

3. Open a terminal in VSCode (Ctrl + `, or use the Terminal -> New Terminal menu option). You would enter the following command but with the zz relaced by the letters in your course-specific aacount.

$ ssh [email protected]

• if your connect to the server for the first time, you may see the message asking if you want to continue connecting.
• type yes and press enter, then give your password

4. Now your terminal should be connected to a computer in the CSE basement, and any commands should be run on that computer too.

3. Trying Some Commands (~5 minutes)

1. cd: command that allows for change of the current working directory of a shell instance

Syntax: cd [dirname]

2. ls: command that lists files and directories within the file system, and shows detailed information about them.

Syntax: ls [options] [files]

3. cp: command used to copy files or group of files or directory

Syntax:

• cp [option] Source Destimation
• cp [option] Source Directory
• cp [option] Source-1 Source-2 Source-3 Source-n Directory

4. cat: command that reads data from the file and gives their content as output

Syntax: cat [filename]

4. Moving Files with scp (~2 minutes)

1. Create a java file on your local computer
2. move that java file to the server with the following command with zz replaced by your course-specific code

scp [filename] [email protected]:~/

3. You should be prompted for a password just like when you log in with ssh
4. Log into ieng6 again, and use ls. You should see the file that you just copied
5. Now you can run that java file on the ieng6 computer using javac and java

5. Setting an SSH Keys (~10 minutes)

1. On client (your local computer), enter the follwing command

ssh-keygen

2. You will see Enter file in which to save the key, enter the follwoing code

(/Users/<user-name>/.ssh/id_rsa): /Users/<user-name>/.ssh/id_rsa

3. You will then see Enter passphrase (empty for no passphrase), press enter directly
4. Press enter again to confirm the empty paraphrase
5. Now we need to copy the public key to the .ssh directory of your user account on the server by going through the following steps

$ ssh [email protected]
<Enter Password> // now on server
$ mkdir .ssh
$ <logout> // back on client
$ scp /Users/<user-name>/.ssh/id_rsa.pub [email protected]:~/.ssh/authorized_keys
  // You use your username and the path you saw in the command above

6. Once you have done all previous steps, you should be able to ssh or scp from this client to the server without entering your password

6. Optimizing Remote Running (~1 minute)

1. You could write a command with quotes at the end of an ssh command to directly run it on the remote server. Here is an example:

$ ssh [email protected] "ls"

2. You can use semicolons to run multiple commands on the same line in most terminals. Here is an example:

$ cp WhereAmI.java OtherMain.java; javac OtherMain.java; java WhereAmI

3. You can use up-arrow on the keyborad to recall the last command that was run.