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

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

#!/bin/bash
#getDependencies.sh by Leif Messinger
	grep -Po '#include\s*"\K.+(?=")' | while read -r line ; do
	echo -n " $line"
	./getDependencies.sh < $line
done

#Leif Messinger
#For when you want to search a lot of words in a file fast

#Arg 1 is the argument the list of words you want to search
#Arg 2 is the file you want to search

#-z means that it looks at the file as a whole, just treating newlines a characters.
#-r is regex. Needed for $, even tho the documentation says you don't need it. They are liars.
#First command replaces all . with \. and all - with \-
#Second command takes all newlines and replaces them with )|(
#Third command takes the trailing |( and deletes it
#Forth command puts a /( at the start
#Fith command puts /!d at the end. This tells it to not delete any lines that match the pattern.

#The second sed takes the output of the first sed as a command that searches any of the combined words
#-f - takes a command from the input
sed -z -r -e 's/\./\\\./g ; s/\-/\\\-/g' -e 's/\n/\)\|\(/g' -e 's/\|\($//' -e 'i/\(' -e 'a/!d' $1 | sed -r -f - $2

awk '\
{ for (i=1; i<=NF; i++) { ++D[$i]; } }\
END { for (i in D) { print i, D[i] } }\
' words.txt | sort -nr -k 2

#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