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"

#for ssh abuse attempts
action = %(action_)s
         %(action_abuseipdb)s[abuseipdb_apikey="", abuseipdb_category="18,22"]
         
actionban = curl --fail --ciphers ecdhe_ecdsa_aes_256_sha --data 'key=<abuseipdb_apikey>' --data-urlencode 'comment=<matches>' --data 'ip=<ip>' --data 'category=<abuseipdb_category>' "https://www.abuseipdb.com/report/json"

#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

touch /tmp/login1.txt /tmp/login2.txt
while [ true ]
do
	who | gawk '{ print $1 }' > /tmp/login2.txt
	comm -13 /tmp/login1.txt /tmp/login2.txt
	#Just a bit easier to read
	#diff /tmp/login1.txt /tmp/login2.txt
	cat /tmp/login2.txt > /tmp/login1.txt
	sleep 1
done

#!/bin/bash
#cpcmd.sh [file1 [file2...]]
#Prints out the commands needed to copy the file to your local machine
#This will work on any server that also has the same hostname as in your hosts file.
#I should update this to detect if a file is a directory, and enable recursion for those commands. If you do it now, it will probably just warn you.
if [ -n "$1" ]; then
		while [ -n "$1" ]; do
				printf "scp \"$(whoami)@$(hostname):"
				printf `readlink -f $1`
				printf "\" .\n"
				shift
		done
else
		echo "scp \"$(whoami)@$(hostname):$PWD/*\" ."
fi

#diskRipper.sh by Leif Messinger
#For use on debian, where your cds aren't immediately mounted
wall "CD inserted boss"
set -x	#echo on

cdDrivePath=$(ls -l /dev/cdrom | awk '{print $NF}')
#CD could have no label, so that's why I need awk
cdLabel=$(lsblk -n "/dev/$cdDrivePath" -o label)
if [[ ! -z "$cdLabel" ]]; then	#CD has label
folderName=$cdLabel
echo "The cd label is ${folderName}"
if mkdir ./cds/"${folderName}"; then	#Folder didn't exist before
sudo mount /dev/cdrom ./.cdmountpoint

sudo cp -r ./.cdmountpoint/* "./cds/${folderName}"
sudo chmod -R 777 "./cds/${folderName}"

sudo umount ./.cdmountpoint
eject
wall "CD done and ejecting"
else
wall "Already read that cd, skipped"
fi
else
wall "CD had no label, skipped"
fi