Bash function for switching AWS profiles

.bash_profile

function aws_switch {
    last_profile=$(cat ~/.aws/.last_profile | xargs)
    last_profile_i=1;
    i=1
    profiles=()
    for profile in $(grep "^\[.*\]$" ~/.aws/credentials | sed -e 's_^\[__' -e 's_\]$__' | sort)
    do
        echo "[$i] $profile";
        profiles+=( "$profile" );
        if [ $last_profile == $profile ]; then
            last_profile_i=$i;
        fi
        let i=i+1;
    done
    while true; do
        read -p "Pick the AWS profile you wish to use [default: $last_profile]:" profile
        profile=${profile:-$last_profile_i}
        if [[ 1 -le $profile ]] && [[ $profile -le $i ]]; then
            let profile_i=$profile-1;
            export AWS_DEFAULT_PROFILE=${profiles[$profile_i]};
            echo "Switched to AWS profile [${profiles[$profile_i]}]";
            echo "${profiles[$profile_i]}" > ~/.aws/.last_profile
            break;
        else
            echo "Invalid profile #: $profile"
            break;
        fi
    done
}