This Bash script prompts the user to input a MAC address and then converts it into an IPv6 address using a custom function

from_mac_address_to_ipv6.bash

#!/bin/bash

tput clear
echo
echo "********************* Hello $USER! *********************"
echo
echo "Please paste MAC address that you want to convert into IPv6:"
read A
ipv6() {
    IFS=':'; set $1; unset IFS
    echo
    echo "IPv6 address is: fe80::$(printf %02x $((0x$1 ^ 2)))$2:${3}ff:fe$4:$5$6"
    echo
}
ipv6 $A
echo
exit 0