reboot-if-no-net-connection


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#!/bin/bash

for i in {1..300}; do

  default_gateway=$(
    ip route \
    | sed '
      s/^default\s\+\S\+\s\+\(\S\+\)\s.*$/\1/
      t
      d
    '
  )

  if [ -n "${default_gateway}" ] \
  && ping -c1 "${default_gateway}" >/dev/null 2>&1; then
    exit
  fi

  sleep 1

done

reboot