#!/usr/bin/env bash
#
spinner(){
    PROC=$1
    BANNER=$2
    while kill -0 "$PROC" >/dev/null 2>&1; do
        echo -ne "$BANNER"
        sleep 0.05
    done
    echo "$BANNER - DONE"
    return 0
}

ifconfig mon down &
spinner "$!" $"Taking mon0 down..."

echo
ifconfig mon0 up &
spinner "$!" $"Putting mon0 up..."

echo