which nginx #查看nginx是否存在
/usr/bin/which: no nginx in (/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/opt/aws/bin:/home/ec2-user/.local/bin:/home/ec2-user/bin)/usr/bin/which:
阅读背景：
亚马逊AWS EC2云实例AMI安装LNMP环境(1)——Nginx安装
来源：互联网
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