Linux Learning 4 network commands and shutdown restart

Network commands

Write

Write user name Enter information after return to Ctrl+d save end

Wall

Wall [message]//that is all, sent to everyone

Ping

Ping option IP address test network connectivity

-C specify number of times to send

Ifconfig

Ifconfig NIC name IP address//view and set NIC information

Eth0 Real Card

Lo:looback, loopback card for native communication and testing

Mail

mail[User Name] View Send electronic right button

Last

Lists user information that has been logged into the system so far

Lastlog

-U check the last logon time for a particular user eg, lastlog-u Lucy

Netstat

Display Network-related information

-T, TCP protocol, TCP Transmission Control Protocol, handshake three times, safe and reliable

-U, UDP protocol, User Datagram Protocol, fast, poor reliability, sometimes may not receive.  QQ is the use of UDP. TCP and UDP cannot be compared for good or bad.

-L, monitoring

-R, routing, routine

-N, IP address and port number

-tlum, view the port of the native listener

-an, view all network connections

-rn, viewing the routing table

Setup

Configure the network through the graphical interface. (Only the Red Hat has this function) I have another article dedicated to the Internet

Mount

Mount. Mount [-t file system] device file point mount point

eg, mount-t Iso9660/dev/sr0/mnt/cdrom

Power off Restart command

Shutdown shut down the machine

shutdown [Options] Time

-C cancels the previous shutdown instruction

-H shutdown

-R Restart

Halt Poweroff Init 0

Restart

Reboot Init 6

Logout Sign Out

System Operation Service

0 shutdown, 1, single user 2, not fully multiuser, no NFS service 3, full multiuser

4, unassigned 5 graphical interface 6 restart

Cat

Cat/etc/inittab Modifying the system default run level

Id:3:initdefault://Very important, backup. Never id:6 ... it will always restart

RunLevel

Querying system Run Level

Linux Learning 4 network commands and shutdown restart