name="John"
echo ${name}
echo ${name/J/j}    #=> "john" (substitution)
echo ${name:0:2}    #=> "Jo" (slicing)
echo ${name::2}     #=> "Jo" (slicing)
echo ${name::-1}    #=> "Joh" (slicing)
echo ${name:(-1)}   #=> "n" (slicing from right)
echo ${name:(-2):1} #=> "h" (slicing from right)
echo ${food:-Cake}  #=> $food or "Cake"

#!/bin/bash

#Leif Messinger lsm0147

#credit.sh FILES
cred="Leif Messinger lsm0147"
for bruh; do
	if [[ $bruh =~ \.cpp|\.c|\.java|\.js ]]; then
		comment="//$cred"
	else

		#Basically everything else gets a pound sign comment

		#Pound signs are standard across linux. bash, sed, gawk, python etc

		#Speaking of which, I need to escape it because of that.
		comment="\#$cred"
	fi
	if [ -s $bruh ]; then

		#If the file has a shebang
		if egrep -q '^#!/' $bruh; then
			sed -i "/^\#!\//a$comment" $bruh
		else
			sed -i "1i$comment" $bruh
		fi
	else
		echo "$comment" > $bruh
	fi
done

for region in `aws ec2 describe-regions --output text | cut -f4`
do
     echo -e "\nListing Instances in region:'$region'..."
     aws ec2 describe-instances --query 'Reservations[*].Instances[*].{Instance:InstanceId,Subnet:SubnetId}' --region $region
done
#This script is to be used with any AWS CLI configured environment, it will list any EC2 instances and their associated subnet network ID's in JSON format

# ---------------- FIREWALL STEPS ----------------


# Check if firewalld is installed and running
sudo systemctl status firewalld


# If it's not running, you can start and enable it
sudo systemctl start firewalld
sudo systemctl enable firewalld


# Add a rule to allow traffic on port 6006. Port 6006 is the default port that storybook runs on.
sudo firewall-cmd --permanent --add-port=6006/tcp


# Reload the firewall for the changes to take effect
sudo firewall-cmd --reload


# Check the list of allowed ports
sudo firewall-cmd --list-ports


# ---------------- NGINX STEPS ----------------


# Install Nginx (if not already installed)
sudo yum install nginx


# Start and enable Nginx
sudo systemctl start nginx
sudo systemctl enable nginx


# Copy your storybook-static directory to a location that Nginx can serve from.

# The default web root directory for Nginx is /usr/share/nginx/html.
sudo cp -r /path/to/storybook-static /usr/share/nginx/html/


# Adjust file permissions if needed to ensure that Nginx can read the files
sudo chown -R nginx:nginx /usr/share/nginx/html/storybook-static


# Put the following server block in /etc/nginx/conf.d/storybook.conf
server {
    listen 6006;
    server_name your_domain.com;

    location / {
        root /usr/share/nginx/html/storybook-static;
        index index.html;
    }
}


# Test the Nginx configuration for syntax errors
sudo nginx -t


# If there are no errors, reload Nginx to apply the changes
sudo systemctl reload nginx

#!/bin/bash

sudo apt install build-essential vulkan-tools libvulkan-dev vulkan-validationlayers-dev spirv-tools libglfw3-dev libglm-dev libtinyobjloader-dev

#The rest of this downloads the Vulkan Tutorial project and its dependencies.
#Comment this out to keep going
exit

sudo apt install git cmake cmake-gui

sudo mkdir /usr/lib/stb

pushd /usr/lib/stb

sudo wget https://raw.githubusercontent.com/nothings/stb/master/stb_image.h

popd

cd ~/Documents

git clone https://github.com/Overv/VulkanTutorial.git

cd VulkanTutorial/code

cmake -S . -B build -DCMAKE_INSTALL_PREFIX:PATH="/usr/local" -DSTB_INCLUDEDIR:PATH="/usr/lib/stb"

cd build

make

#pinger.sh by Leif Messinger

#./pinger.sh [ADDRESS] to search

#./pinger.sh [ADDRESS] & to search in the background

#https://serverfault.com/a/42382
ping_cancelled=false # Keep track of whether the loop was cancelled, or succeeded
until ping -c1 "$1" >/dev/null 2>&1; do :; done & # The "&" backgrounds it
trap "kill $!; ping_cancelled=true" SIGINT
wait $! # Wait for the loop to exit, one way or another
trap - SIGINT # Remove the trap, now we're done with it
if [ "$ping_cancelled" == true ] #https://stackoverflow.com/a/21210966/10141528
then
	printf "The pinger for $1 just closed bro.\n"
else
	printf "$1 IS UP BROOO\a\n"
fi