Cannot connect to internet after changing MAC Address

I've been making a BASh script that changes your MAC Address to that of any manufacturer of your choice from a list. At the last part of the script that is run, it stops before finishing. Here is the code for that part: function spoofUseMAC() { echo read -p "[*] $($stopAllFX; $bgBlack; $white)Enter the number code for manufacturer: >>> " num echo "[-] Generating MAC Address" num=$( expr $num - 1 ) declare -a array while read -r; do array+=( "$REPLY" ) done >> " iface $yellow; echo "[-] $iface selected !" $white; echo "[-] Disabling $iface ..." ifconfig $iface down ifconfig '$iface' hw ether '$macAddress' echo "[-] MAC Address spoofed !" sleep 1 echo "[-] Enabling $iface ..." ifconfig '$iface' up echo "[-] $iface enabled !" echo "[-] Using address: $macAddress" exit } function spoofSearchAgainOrNot() { $bold; $white; echo echo "[*] $($stopAllFX; $bgBlack; $white)Please select an option from the list below:" $yellow; $bold; echo " [$($white)0$($yellow)] $($stopAllFX; $bgBlack; $white)Search again" $yellow; $bold; echo " [$($white)1$($yellow)] $($stopAllFX; $bgBlack; $white)Use one of these" read -p ">>> " searchAgainOrNot if [[ "$searchAgainOrNot" == "0" ]]; then spoofSearch elif [[ "$searchAgainOrNot" == "1" ]]; then spoofUseMAC else spoofSearchAgainOrNot fi } # Spoof, search option selected function spoofSearch() { $bold; echo read -p "[*] $($stopAllFX; $bgBlack; $white)Search for a manufacturer: >>> " search $blue; awk -F '#' '{printf("%10d %s\n", NR, ":" $1 )}' /usr/bin/oui.txt | grep -i $search spoofSearchAgainOrNot } # Spoof function spoof() { echo; $white echo "[*] $($stopAllFX; $bgBlack; $white)Please select an option from the list below:" $yellow; $bold; echo " [$($white)0$($yellow)] $($stopAllFX; $bgBlack; $white)Search for a manufacturer" $yellow; $bold; echo " [$($white)1$($yellow)] $($stopAllFX; $bgBlack; $white)Browse for a manufacturer through $($bold)long $($stopAllFX; $bgBlack; $white)list" read -p ">>> " searchOrBrowse if [[ $searchOrBrowse == "0" ]]; then spoofSearch elif [[ $searchOrBrowse == "1" ]]; then spoofBrowse else spoof fi } Why can't I use the internet (git clone says could not resolve hostname: github.com) after running this script? And why is it not finishing? EDIT: This is supposed to work on MacOS and Linux. On MacOS, there is no ip route command, but in Linux, ip route results in: 192.168.0.0/24 dev wlp1s0 proto kernel scope link src 192.168.0.18 192.168.0.0/24 dev wlp1s0 proto kernel scope link src 192.168.0.18 metric 600