USB Tethering

t.sh

#!/bin/env bash

function getName () {
  ip -o link | while read line
  do
    t=`echo $line | sed -e "s/^[^:]\+: \([^:]\+\):.*/\1/"`
    if [[ $t = "usb0" || $t =~ enp.s..u. ]]; then
      echo $t
      break
    fi
  done
}

if [[ $1 = "r" ]]; then
  dev=`getName`
  echo "Restarting $dev"
  dhcpcd -x $dev
  dhcpcd $dev
  echo "Restart $dev"
  exit 0
fi

#systemctl stop network.service
name=`getName`
ip link set $name up
dhcpcd $name
echo $name