# Three ways of checking if a file exists in a shell script

FILE=/etc/resolv.conf

if test -f "$FILE"; then
    echo "$FILE exists."
fi

if [ -f "$FILE" ]; then
    echo "$FILE exists."
fi

if [[ -f "$FILE" ]]; then
    echo "$FILE exists."
fi

#!/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

#!/bin/bash

for branch in $(git branch | cut -c 3-); do
    read -p "Delete local branch $branch? (y/n) " -n 1 -r
    echo ""
    if [[ $REPLY =~ ^[Yy]$ ]]; then
        git branch -D $branch
    fi
done

#!/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

#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