Solving Bandit from OverTheWire

bandit.sh

#!/usr/bin/env bash

SERVER=bandit.labs.overthewire.org
PORT=2220

BASEUSER="bandit"
PASSWORD="bandit0"
COMMANDS[0]='cat readme'
COMMANDS[1]='cat ./-'
COMMANDS[2]='cat "spaces in this filename"'
COMMANDS[3]='cat inhere/.hidden'
COMMANDS[4]='cat inhere/-file07'
COMMANDS[5]='echo $(find inhere/ -type f -size 1033c | xargs cat)'
COMMANDS[6]='find / -user bandit7 -group bandit6 -size 33c | xargs cat'
COMMANDS[7]='cat data.txt | grep "millionth" | xargs -n1 | tail -n1'
COMMANDS[8]='cat data.txt | sort | uniq -u'
COMMANDS[9]='strings data.txt | grep "==" | tail -n1 | xargs -n1 | tail -n1'

for i in ${!COMMANDS[*]}
do
    USER="$BASEUSER$i"
    COMMAND=${COMMANDS[$i]}
    echo "[ $i ] >>> sshpass -p $PASSWORD ssh -p $PORT $USER@$SERVER"
    echo "[ $i ] >>> $COMMAND"
    PASSWORD=$(sshpass -p $PASSWORD ssh -p $PORT $USER@$SERVER "$COMMAND" \
	       2>/dev/null)
    echo "[ $i ] <<< $PASSWORD"
done

((i++))
USER="$BASEUSER$i"
sshpass -p $PASSWORD ssh -p $PORT $USER@$SERVER