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

#!/bin/bash

#Changes the remote url from https to ssh.

#Only works for github, because I'd have to store a dictionary of every https to ssh url otherwise.

#Made using Bing Chat


# Get the remote URL from the console
REPO_URL=$(git config --get remote.origin.url)


# Check that REPO_URL contains https://github.com
if [[ $REPO_URL == *"https://github.com"* ]]; then

    # Replace https with ssh in the URL  
    REPO_URL=${REPO_URL/https:\/\/github.com\//[email protected]:}

    # Change the remote URL to the SSH version
    git remote set-url origin "$REPO_URL"

else
    echo "Error: REPO_URL does not contain https://github.com" >&2
    exit 1
fi

#!/usr/bin/env bash


#Splits a command across a number of CELL machines

user=$(whoami)
if [[ -z $user ]]; then
	echo "whoami failed. Exiting..."
	exit 1
fi

command="$1"
if [[ -z $command ]]; then
	echo "Need to put in a command."
	exit 1
fi
shift

array=("$@")

let start=8
let stop=18

for ((i = $start; i <= $stop; i++)); do
	extraZero=$(if [[ "$i" -lt 10 ]]; then echo "0"; fi)
	domain="CELL${extraZero}${i}-CSE.ENG.UNT.EDU"
	let "index = i - start"
	echo ${#array[@]}
	if [[ ${#array[@]} != 0 ]] && [[ $index -ge ${#array[@]} ]]; then
		echo "$index > ${#array[@]}"
		break
	fi
	ssh -o StrictHostKeyChecking=accept-new "${user}@${domain}" -t "$command ${array[$index]}" &
done

#!/bin/bash

#Takes all the c and h files in the current directory and prints them

#Yup, it's that easy
for file in *.h *.hpp *.c *.cpp; do

	#If it exists
	if [ -f "$file" ]; then
	echo "//===============$file==============="
	cat $file
	fi
done

#!/bin/sh

BAT_LOW=15
BAT_CRITICAL=5

if [ "$1" = "--help" ]
then
    printf "
    Usage:
    \tbattery_check.sh warning%% hibernate%%

    Description:
    \tA script for notifying the user via dunst and logging when
    \tthe battery is low and the system is going to hibernate.
    \tCan be supplied arguments for the battery low warning and
    \thibernation percentage thresholds as the first and second arguments.

    \t Default behavior is to warn at 15% and hibernate at 5%."
    exit
fi

if [[ -n "$1" && -n "$2" && $1 -gt $2 ]]
then
    BAT_LOW=$1
    BAT_CRITICAL=$2
fi

acpi -b | awk -F'[,:%]' '{print $2, $3}' | {

    read -r status capacity
    echo Low threshold: $BAT_LOW, Hibernate threshold: $BAT_CRITICAL
    echo Status: $status, Capacity: $capacity

    if [ "$status" = Discharging -a "$capacity" -le $BAT_CRITICAL ]; then
        echo Battery critical threshold.
        dunstify -u critical "Critical battery threshold, hibernating..."
        logger "Critical battery threshold, hibernating..."
        sleep .5
        systemctl hibernate
        exit
    fi

    if [ "$status" = Discharging -a "$capacity" -le $BAT_LOW ]; then
        echo Battery low threshold.
        dunstify -u critical 'Battery low! System will hibernate at 5%.'
        logger 'Battery low! System will hibernate at 5%.'
        sleep .5
        light -S 15
        exit
    fi
}