answer (kath)

exercise/solutions/part-1.md

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+# Logging in
+
+The following are procedures for logging in to the COARE HPC via the following OS: Windows, Mac, and Linux.
+
+## Table of Contents
+
+- [For Windows](#for-windows)
+  - [PuTTY](#putty)
+  - [Command Prompt (for Windows 10 only)](#command-prompt-for-windows-10-only)
+- [For Mac / Linux](#for-maclinux)
+
+## For Windows
+
+### PuTTY
+
+1. Download and run PuTTY application.
+
+   - [32-bit:](https://the.earth.li/~sgtatham/putty/latest/w32/putty.exe)
+   - [64-bit:](https://the.earth.li/~sgtatham/putty/latest/w64/putty.exe)
+
+2. Set port number to **22** and the **Host Name** to **saliksik.asti.dost.gov.ph**.
+
+   ![Set Port Number](../solutions/images/putty_2.png)
+
+3. On the left panel under Category, collapse the **Connection** option and select the **SSH** option, and then click **Auth**. Select **Browse** to attach your **private key** (.ppk file) for authentication. Then click **Open**.
+
+   ![Set Port Number](../solutions/images/putty_3.png)
+
+4. Select **Yes** when prompted by a PuTTY Security Alert Window.
+
+   ![Set Port Number](../solutions/images/putty_4.png)
+
+5. When the terminal opens, enter your COARE credentials that should have been sent to your email.
+
+6. You are now inside the HPC frontend if you see this (see image below) on your terminal.
+
+   ![Set Port Number](../solutions/images/putty_6.png)
+
+   **NOTES:**
+
+   - Accessing HPC must be passwordless unless you have a passphrase during the generating of keys.
+   - If you want to use your key (generated using PuTTY) in OpenSSH, check this tutorial on [converting PuTTY (.ppk) key to SSH Key](https://www.simplified.guide/putty/convert-ppk-to-ssh-key).
+   - You cannot use your OpenSSH keys to PuTTY and vice versa.
+
+### Command Prompt (for Windows 10 only)
+
+1. Open **Command Prompt** or **Windows PowerShell**.
+2. Type command:
+
+   ```
+   ssh <username>@saliksik.asti.dost.gov.ph
+   ```
+
+   Useful options:
+   | Flag | Description |
+   | ----------------- | ------------------------------------------------------------ |
+   | -i <private-keys> | Indicate the private key to be used |
+   | -v | Increase verbosity |
+   | -vv, -vvv | Enable additional verbosity for even more debugging messages |
+
+3. Type **Yes** to add the host in your known hosts.
+
+   ![Set Port Number](../solutions/images/cmd_3.png)
+
+4. You should now be inside the HPC frontend.
+
+   ![Set Port Number](../solutions/images/cmd_4.png)
+
+   **Notes:**
+
+   - Logging in must be passwordless unless you have a passphrase during the generating of keys.
+   - If you want to use your key (generated using PuTTY) in OpenSSH, check this tutorial on [converting PuTTY (.ppk) key to SSH Key](https://www.simplified.guide/putty/convert-ppk-to-ssh-key).
+   - You cannot use your PuTTY keys to OpenSSH and vice versa.
+
+## For Mac/Linux
+
+1. Launch your Terminal application and type:
+
+   ```
+   ssh <username>@saliksik.asti.dost.gov.ph
+   ```
+
+   Useful Options:
+   | Flag | Description |
+   | ----------------- | ------------------------------------------------------------ |
+   | -i <private-keys> | Indicate the private key to be used |
+   | -v | Increase verbosity |
+   | -vv, -vvv | Enable additional verbosity for even more debugging messages |
+
+2. Type **Yes** to add the host in your known hosts.
+
+   ![Set Port Number](../solutions/images/mac-linux_2.png)
+
+3. You are now inside the HPC Frontend.
+
+   ![Set Port Number](../solutions/images/mac-linux_3.png)
+
+   **NOTE:** Logging in must be passwordless unless you have a passphrase during the generating of keys.

exercise/solutions/part-2.md

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+> This is a paragraph. First line.  
+> Next line.  
+> Third line.  
+> There should be no extra spacing between each line.  
+> _**This line is both italic and bold!**_
+>
+> There is a blank space above.  
+> This <sub>line</sub> of <sup>text</sup> is <sub>wavy.</sub>
+
+My favorite equation is:
+
+$$ \frac{-b \pm \sqrt{b^2 -4ac}}{2a} $$

exercise/solutions/part-3.md

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+# **Exercises**
+
+- [x] Part 1 - [Solution](part-1.md)
+- [x] Part 2 - [Solution](part-2.md)
+- [x] Part 3 - [Solution](part-3.md)
+
+By: [Kathleen Hanna D. Fusilero](mailto:kathleen.fusilero@smc.pshs.edu.ph)