#!/bin/sh## script_tool_for_linux## Use command: `sudo sh script_tool_for_linux.sh` or#    `su -c 'sh script_tool_for_linux.sh'`# to update your hosts file.## WARNING: the script CAN NOT replace others' hosts rules.#   If you have hosts rules provided by others, you may get conflict.#if [ `id -u` -eq 0 ]; then curl -fLo /tmp/fetchedhosts 'https://raw.githubusercontent.com/racaljk/hosts/master/hosts' sed -i '/# Copyright (c) 2014/,/# Modified hosts end/d' /etc/hosts sed -i "s/localhost/`hostname`/g" /tmp/fetchedhosts cat /tmp/fetchedhosts >> /etc/hosts rm -f /tmp/fetchedhosts echo 'Success.'else echo 'Permission denied, are you root?'fi