Linux下的一些常用命令汇总

  Linux 常用命令:

            linux 下某些文本不能vi                                   ll -a  然后删除 产生原因:vi的时候没有正常保存退出

            linux 复制光标前一行内容 粘贴到指定位置    yy 复制                p 粘贴

            显示当前所处位置的                                     pwd

            递归创建上级文件夹                                     mkdir -p

            创建空白文件                                                touch

            删除文件(夹)，不论层级多深                        rm -rf

            修改权限                                                       chmod u+x f1       u g o 分别代表所有者

            设置ip地址                                                     service network restart   验证 ifconfig

            关闭防火墙                                                    service iptables stop    验证 service iptables status

            关闭防火墙的自动运行                                  chkconfig iptables off   验证 chkconfig --list | grep iptables

            设置主机名                                                    临时: hostname   xxxx  

                                                                                  永久:vi /etc/sysconfig/network  地址 hostname

            ip与hostname绑定                                         vi /etc/hosts          验证:ping xxxx

            设置ssh免密码登陆                                       (1)ssh-keygen -t rsa   

                                                                                  (2)cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

                                                                                  (3)ssh xxx
     hadoop 常用命令:

         解除hadoop的安全模式                                  hadoop dfsadmin -safemode leave

         hadoop 运行jar包程序                                    hadoop jar jar包名称 [输入路径(可选) 输出路径(可选)]

         hadoop 删除所有文件                                   hadoop fs -rmr hdfs://hostname:端口号/*