chmodGame.sh

#!/usr/bin/env bash

# Creates a file called test.txt
FILE_NAME="chmod_game.txt"

get_random() {
    shuf -i 0-$1 -n 1
}

owner=$(get_random 7)
group=$(get_random 7)
world=$(get_random 7)

touch $FILE_NAME
chmod 000 $FILE_NAME
echo "File created with no permissions: $FILE_NAME"
ls -l $FILE_NAME

verbalize_permission() {
    echo -n "$1's Permissions: "
    permission=$2
    if ((($permission & 4) != 0)); then
        echo -n "r"
    fi
    if ((($permission & 2) != 0)); then
        echo -n "w"
    fi
    if ((($permission & 1) != 0)); then
        echo -n "x"
    fi
    echo
}

verbalize_permission "Owner" $owner
verbalize_permission "Group" $group
verbalize_permission "World" $world

echo "Try adding these permissions to the file: $FILE_NAME"