Linux Engineer Study Notes Practice 2: System management commands used

1. Useradd redhat

2. Passwd redhat

3. Su --

4. Exit

5. Df-h geographical situation

6. Du-sh / * file or directory statistics the use of space the size of

7. Fdisk-l / dev / sda

8. Netconfig to configure the network parameters

9. Ifconfig shows the network configuration information

10. Service network restart

11. Route-n Show the routing information (default routing)

12. Ping-b 192.168.0.255 scanning the entire network segment (to check the activities of the host)

13. Ifconfig eth0 10.0.0.254 netmask 255.255.255.0 modify IP Address

14. Ifconfig eth0 card shows the parameters specified

15. Modify IP information to delete the default route will be added manually

route add default gw 192.168.0.1

16. Ifconfig route parameters modified will not be saved, will disappear after restart

Service network restart command to use the parameters saved to the file ifcfg-eth0

/ etc/sysconfig/network-scripts/ifcfg-eth0

Vi can directly modify the document, and then re-enable the service network restart network services

17. Redhat-config-network-tui is a unique configuration tool redhat, when using this command to configure network parameters, we will write to the / etc / sysconfig / networking / profiles / directory, and more than network-scripts/ifcfg- eth0 priority, so this tool used to configure not have to use netconfig, or empty the directory first profiles