Router#show ?
aaa Show AAA values
access-lists List access lists
arp Arp table
cdp CDP information
class-map Show QoS Class Map
clock Display the system clock
controllers Interface controllers status
crypto Encryption module
debugging State of each debugging option
dhcp Dynamic Host Configuration Protocol status
dot11 IEEE 802.11 show information
ephone Show all or one ephone status
file Show filesystem information
flash: display information about flash: file system
frame-relay Frame-Relay information
history Display the session command history
hosts IP domain-name, lookup style, nameservers, and host table
interfaces Interface status and configuration
ip IP information
ipv6 IPv6 information
logging Show the contents of logging buffers
login Display Secure Login Configurations and State
mac-address-table MAC forwarding table
ntp Network time protocol
parser Show parser commands
policy-map Show QoS Policy Map
privilege Show current privilege level
processes Active process statistics
protocols Active network routing protocols
queue Show queue contents
queueing Show queueing configuration
running-config Current operating configuration
secure Show secure image and configuration archive
sessions Information about Telnet connections
snmp snmp statistics
spanning-tree Spanning tree topology
ssh Status of SSH server connections
startup-config Contents of startup configuration
storm-control Show storm control configuration
tcp Status of TCP connections
tech-support Show system information for Tech-Support
terminal Display terminal configuration parameters
users Display information about terminal lines
version System hardware and software status
vlan-switch VTP VLAN status
vtp Configure VLAN database
Router#show
Router#show ip ?
access-lists List access lists
arp IP ARP table
bgp BGP information
dhcp Show items in the DHCP database
eigrp IP-EIGRP show commands
inspect CBAC (Context Based Access Control) information
interface IP interface status and configuration
ips IPS (Intrusion Prevention System) information
nat IP NAT information
nbar Network-Based Application Recognition
ospf OSPF information
protocols IP routing protocol process parameters and statistics
rip IP RIP show commands
route IP routing table
ssh Information on SSH
show interfaces：显示所有路由器端口状态，如果想要显示特定端口的状态，我们可以键入“show interfaces”
后面跟上特定的网络接口和端口号即可，如：router#show interfaces serial 0/1。
show controllers serial：显示特定接口的硬件信息。
show clock：显示路由器的时间设置。
show hosts：显示主机名和地址信息。
show users：显示所有连接到路由器的用户。
show history：显示键入过的命令历史列表。
show flash：显示flash存储器信息以及存储器中的IOS映象文件。
show version：显示路由器信息和IOS信息。
show arp：显示路由器的地址解析协议列表。
show protocol：显示全局和接口的第三层协议的特定状态。
show startup-configuration：显示存储在非易失性存储器（NVRAM）的配置文件。0 0 0 0 0 0 0 0 0
show running-configuration：显示存储在内存中的当前正确配置文件。
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