Double quites

src/freedombone-wifi

     passphrase=$2
     psk=$(wifi_get_psk "$ssid" "$passphrase")
     echo "auto $WIFI_INTERFACE" > /etc/network/interfaces.d/wifi
-    echo 'iface $WIFI_INTERFACE inet dhcp' >> /etc/network/interfaces.d/wifi
+    echo "iface $WIFI_INTERFACE inet dhcp" >> /etc/network/interfaces.d/wifi
     echo "    wpa-ssid $ssid" >> /etc/network/interfaces.d/wifi
     echo "    wpa-psk $psk" >> /etc/network/interfaces.d/wifi
 }
 function wifi_none {
     ssid=$1
     echo "auto $WIFI_INTERFACE" > /etc/network/interfaces.d/wifi
-    echo 'iface $WIFI_INTERFACE inet dhcp' >> /etc/network/interfaces.d/wifi
+    echo "iface $WIFI_INTERFACE inet dhcp" >> /etc/network/interfaces.d/wifi
     echo "    wireless-essid $ssid" >> /etc/network/interfaces.d/wifi
 }