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# Weetile's RHUL resources # Weetile's RHUL resources
If you learnt something new, please consider tipping at my Ko-fi! Reminder -- you can access the **Table of Contents** to easily skip to a specific section!
![image](https://github.com/Weetile/weetile-compsci-rhul-resources/assets/7700383/b7dbfd71-d7a1-4a74-90fb-3e40ff8fa0e3)
If you learnt something new, please consider **tipping** at my Ko-fi!
[![Ko-Fi Tip Jar](https://i.imgur.com/5CmP1jo.png)](https://ko-fi.com/weetile) [![Ko-Fi Tip Jar](https://i.imgur.com/5CmP1jo.png)](https://ko-fi.com/weetile)
## Linux CIM ## Linux CIM Tips and Tricks
### Creating an SSH alias ### Creating an SSH alias
You can easily create an SSH alias to make it **easier** and **more convenient** to connect to the Linux servers. You can easily create an SSH alias to make it **easier** and **more convenient** to connect to the Linux servers.
👎 Normally, you'd authenticate to the Linux servers as such: 👎😱 Normally, you'd authenticate to the Linux servers by specifying the username and host address:
ssh USERNAME@linux.cim.rhul.ac.uk ssh USERNAME@linux.cim.rhul.ac.uk
👍🌟 By creating an SSH alias, all you have to type in is this: 👍🌟 By creating an SSH alias, you can omit the username and host address as such:
ssh rhul ssh rhul
To do this, you'll need to modify your ssh config. (`~/./ssh/config`) Make sure to create the file if it doesn't exist, then append the following to the file, replacing USERNAME with your RHUL username (e.g: ZLAT262 or similar) To do this, you'll need to modify your ssh config. This can be found at `~/./ssh/config`.
Make sure to **create the file if it doesn't exist**, then **append the following** to the file, replacing USERNAME with your RHUL username (e.g: ZLAT262 or similar)
``` ```
Host rhul Host rhul
User zlac218 User zlac218
HostName linux.cim.rhul.ac.uk HostName linux.cim.rhul.ac.uk
``` ```
That's it! You can now access the Linux server by just typing in `ssh rhul` ✨ **That's it**! You can now access the Linux server by just typing in `ssh rhul` ✨
Want to be able to login without typing in your password everytime? See the next section 😜 Want to be able to login without typing in your password everytime? See the next section 😜
### Using SSH authentication for security and speed ### Using SSH authentication for security and speed
![image](https://github.com/Weetile/weetile-compsci-rhul-resources/assets/7700383/15b130cd-bd55-470b-95e7-74b76a7bdd0d)
Using SSH public key authentication is more secure and more importantly -- means you don't have to type in your password everytime you authenticate to the CIM servers! Using SSH public key authentication is more secure and more importantly -- means you don't have to type in your password everytime you authenticate to the CIM servers!
To generate a new SSH keypair, you can run the following command on Linux: To generate a new SSH keypair, you can run the following command on Linux:
` `
@ -34,11 +46,15 @@ Once you have your keypair saved, you can upload it to the Linux servers using t
ssh-copy-id USERNAME@linux.cim.rhul.ac.uk ssh-copy-id USERNAME@linux.cim.rhul.ac.uk
You can confirm the SSH key has been added by authenticating to the server. If it doesn't ask you for your password, it's all set! You can confirm the SSH key has been added by authenticating to the server. If it doesn't ask you for your password, it's all set!
### Accessing Linux server off-campus in the evening ### Accessing Linux server off-campus in the evening
![image](https://github.com/Weetile/weetile-compsci-rhul-resources/assets/7700383/b953bf4b-b5ca-4655-bbd7-8f901ae5e31e)
The RHUL Linux machines **aren't able to be accessed off-campus in the evening** due to security reasons. To circumvent this, you can **connect to the RHUL VPN** by following [this guide](https://intranet.royalholloway.ac.uk/students/help-support/it-services/access-off-campus/vpn/vpn.aspx). The following information in this section is copied verbatim from that guide. The RHUL Linux machines **aren't able to be accessed off-campus in the evening** due to security reasons. To circumvent this, you can **connect to the RHUL VPN** by following [this guide](https://intranet.royalholloway.ac.uk/students/help-support/it-services/access-off-campus/vpn/vpn.aspx). The following information in this section is copied verbatim from that guide.
On **Linux**, download and install [this file](http://intranet.royalholloway.ac.uk/it/programs/pangplinux-5.2.4-c14.tgz) to connect to the VPN. - On **Linux**, download and install [this file](http://intranet.royalholloway.ac.uk/it/programs/pangplinux-5.2.4-c14.tgz) to connect to the VPN.
On **Windows**, follow these instructions to download and install the VPN: - On **Windows**, follow these instructions to download and install the VPN:
1. Open your web browser and visit [https://student-vpn.royalholloway.ac.uk](https://student-vpn.royalholloway.ac.uk/). Please note that you must use 'royalholloway' and not 'rhul' 1. Open your web browser and visit [https://student-vpn.royalholloway.ac.uk](https://student-vpn.royalholloway.ac.uk/). Please note that you must use 'royalholloway' and not 'rhul'
2. Log in using your university username and password 2. Log in using your university username and password
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``` ```
Restart the application and you should be good to go! Restart the application and you should be good to go!
### Accessing the filesystem through Dolphin ### Accessing the filesystem through Dolphin
You can access the Linux CIM server in Dolphin by using the `fish` server. To test this, access this protocol in Dolphin, replacing USERNAME with your username (e.g: ZLAT262): The `fish` protocol allows you to access the filesystem of the Linux CIM server in Dolphin remotely. Navigate to this location in Dolphin, replacing USERNAME with your username (e.g: ZLAT262):
``` ```
fish://USERNAME@linux.cim.rhul.ac.uk:22 fish://USERNAME@linux.cim.rhul.ac.uk:22
``` ```
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alias rhulgcc='gcc -Wall -Werror -Wpedantic' alias rhulgcc='gcc -Wall -Werror -Wpedantic'
``` ```
If you enter this command, `rhulgcc` will be aliased until the shell has terminated. To make these changes persistent, we can modify the `~/.bashrc` file (or `~/.zshrc`) if applicable by appending that alias command to the bottom. Remember to restart the shell for these changes to take effect. If you enter this command, `rhulgcc` will be aliased until the shell has terminated. To make these changes persistent, we can modify the `~/.bashrc` file (or `~/.zshrc`) if applicable by appending that alias command to the bottom. Remember to restart the shell for these changes to take effect.
The `-o` flag allows you to specify the name of the output file, by default it will be `a.out`.
```
gcc filename.c -o outputfile
```
Note that these flags will also work for compiling C++ code using `g++`.