Network communication command
Command name: write
the path where the command: / usr / bin / write
execute permissions: All users
Description: send a message to another user, ctrl + d end, another user must log
syntax: write <user name>
command name: wall
path command where: / usr / bin / wall
execute permissions: All users
description: send a message to all users
syntax: wall [message] [filename]
Wall information
command name: pingl
path which the command: / usr / sbin / ping
execution permissions: root
function description: to test network connectivity
syntax: ping ip address
frequency transmission request -c
-s transmission packet size
command name: ifconfigl
view the card information
command name: shutdown
command the path: / usr / sbin / shutdown
execution permissions: root
description: off
syntax: the shutdown
the shutdown -h now immediately shutdown
command name: reboot
command the path: / usr / sbin / reboot
execute permissions: root
description: reboot
syntax: reboot