[bash]判断当前用户是否为root

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#!/bin/bash# function: tell effect user is root；# update: 2017-05-02###1.利用$()的命令替换if [ "$(whoami)" == "root" ]then    echo "root";fi# [ 是保留字符，两边要加空格！if [ "`whoami`" == "root" ]then    echo "root";fi###2.利用bash内置变量EUID(effect uid)if [[ $EUID -eq 0 ]]then    echo "root";fi###3.利用id命令if [ "$(id -u)" == "0" ]then    echo "root";fiif [ $(id -u) -eq 0 ]then    echo "root";fi###4. 利用whoami命令if ［ `whoami` = "root" ］then    echo "root";fi