环境变量export 导出系统环境变量环境变量调用要加$echo $HOSTNAME (查看主机名)pwd 查看当前目录临时:export lin=“/etc/tmp” #定义lin为/etc/tmpcd $lin永久:/etc/bashrcexport aa=“/etc/mnt”刷新:(source)source /etc/bashrc用户下使用profile写入 用户专属变量 ls -a 进入用户目录
cp -i 可复制并改名history清理别名（alias）alias qq=“clear”alias rr=“操作参数” #别名rr加操作参数unalias qq #取消别名永久生效全局 : vim /etc/bashrc局部到用户目录下的profile写入或.bashrc设置后都必须刷新source！！！source /etc/bashrcscp（远程拷贝）scp linhut@192.168.0.9:/tmp/teamviewer_10.0.37742.1686.rpm /tmpssh（远程连接）[root@desktop38 ~]# ssh root@192.168.0.11The authenticity of host ‘192.168.0.11 (192.168.0.11)’ can’t be established.ECDSA key fingerprint is 20:3f:01:4c:35:52:e6:51:fa:b2:48:37:e8:21:e1:07.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added ‘192.168.0.11’ (ECDSA) to the list of known hosts.root@192.168.0.11’s password:Last login: Mon Jul 17 11:37:15 2017 from desktop22.example.com秘钥存放文件：/root/.shh/known_hosts生成公钥:ssh-keygenGenerating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):ssh-copy-id -i IP #把公钥给别人 接受秘钥地址：/root/.sshtraceroute ip地址 查看路由跳数netstat -tplnt：tcpp：进程l : 侦听n: name -r 查看网关screen #同步共享屏幕yum install screen -yscreen -s youname #申请查看
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