This is a page that will be used to post short Linux Tips & Tricks... Quick "How To" activities to build a more robust repertoire of Linux skills. So that means it's a Mish-Mash of class material for the learning about Linux and the Linux Command line.
Let's get started... Its going to be a fun, awesome ride...
Sid Bar for Teachers: This Unit and lessons is really about how I run Lessons & Labs in my class. Many of the lessons might be specific to my class, but you could probably adjust them for your class. I'll try to make them a neutral as I can, so they can be used in any Mathematics, Physics, Computer Science, or any other Engineering / Technology class. Let me know how I can make that better. I'll try to keep this unit current and relevant. Please let me know if any resource links are broken or not accessible. Use this email link to let me know what is broken @ TopClown@STEAMClown.org
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Launching a text editor from the command line is easy. But you need to have it installed. Navigate to the directory where your file is. You can check the ownership with the command
$ ls -la
If needed, you can change the ownership of a file. Be careful when you do this. In most cases, if you use the sudo prefix command, you will be able to open a s edit files that are "root" rather than $USER. The following command will change the ownership of a file.
$ sudo chown -R $USER <path_to_file>
$ sudo chown -R $USER /var/www/html
You can use the which command to find if you have a specific editor, program or app installed.
$ which vi
$ which nano
$ which mousepad
mousepad is the default graphical text editor on the Raaspbian Linux OS build. I know I should work on my vi, vim, nano skills, but I'm lazy sometimes.
$ sudo mousepad
This opens the file in sudo mode and you should be able to write to it and save your changes.
If you can ping your Raspberry Pi from your laptop but not the other way around, it is likely due to firewall settings on your laptop. Here's what you should check:
If your laptop is running Windows, the built-in firewall blocks ICMP (ping) requests by default.
Open Windows Defender Firewall.
Click Advanced Settings.
Go to Inbound Rules → Look for File and Printer Sharing (Echo Request - ICMPv4-In).
Enable this rule.
On Mac/Linux, check if ufw (Uncomplicated Firewall) or iptables is blocking ICMP:
Run: sudo ufw status (for Ubuntu)
If it says "Active," allow ping: sudo ufw allow icmp
For iptables: sudo iptables -L and look for any rules blocking ICMP.
Make sure you're pinging the correct local IP address.
On Windows: ipconfig
On Mac/Linux: ifconfig or ip a
Both devices should be on the same subnet.
Run ip route on the Raspberry Pi to verify the network route.
Instead of ping, try arp -a to see if your Pi can detect the laptop on the network.
This Lesson is coming soon - click here to be notified when it's available
Linux - <topic> - 📖 Lesson Tutorial
Linux - <topic> - 📽️ Video / 🎧 Podcast
Linux - <topic> - 📰 Slide Presentation (Coming Soon... Really, I'm working on it...)
Linux - <topic> - LAB #1 - 🛠️ LAB Activity
Linux - <topic> - LAB #2 - 🛠️ LAB Activity
Linux - <topic> - LAB #3 - 🛠️ LAB Activity
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