linux[Basic]-06--System State Detection command [01]

System Status Detection commands

1. ifconfig : Used to obtain network card configuration and networking status information, format: ifconfig [network Devices] [parameters]

One of the following lo is a local loopback port

2. uname : Used to view the kernel version information of the system, in the format:uname [ -A]

View the kernel name of the system, kernel release, kernel version, node name, hardware name

Hardware platform, processor type, operating system, etc.

Uname-r View Kernel release version number

uname-a View all information

3. uptime : Used to view the load situation of the system, in the form of: uptime

You can use "Watch-n 1 uptime" To refresh the system load every second

4. free: Used to display the current system memory usage in the format: free [-m/-g]

	Total amount of memory	Amount already used	Available dosage	The amount of memory that the process shares	Amount of disk cache memory	Amount of memory Cached
	Total	Used	Free	Shared	Buffers	Cached
Mem:	1483	885	598	9	0	255
Swap:	2047	0	2047

5. who: Used to view the current logged in host user situation, in the format: Who[ parameters]

[email protected] ~]# who

User name Terminal Equipment time to log on to the system

root:0 2017-09-14 14:05 (: 0)

Root PTS/1 2017-09-14 14:30 (192.168.23.6)

6. Last: Used to view all system registration records in the format: last [parameter]

[Email protected] ~]# last

Root PTS/3 192.168.23.6 Mon 14:30 still logged in

Root pts/1 192.168.23.6 Thu Sep 14:30 still logged in

Root PTS/2 192.168.200.2 Thu Sep 14:10 still logged in

Root PTS/1 192.168.200.2 Thu Sep 14 14:08-14:10 (00:02)

Root pts/0:0 Thu Sep 14:06 still logged in

root:0:0 Thu Sep 14:05 still logged in

(unknown:0:0 Thu Sep 14 14:05-14:05 (00:00)

Reboot system boot 3.10.0-229.el7.x Thu Sep 14 22:04-15:19 ( -31+-6:-45)

BDQN pts/0:0 Tue Nov 24 10:49-10:49 (00:00)

BDQN pts/0:0 Tue Nov 24 10:48-10:48 (00:00)

bdqn:0:0 Tue Nov 24 10:47-10:49 (00:01)

(unknown:0:0 Tue Nov 24 10:46-10:47 (00:01)

Reboot system boot 3.10.0-229.el7.x Tue Nov 24 18:45-10:49 ( -7:-56)

Wtmp begins Tue Nov 24 18:45:30 2015

7. History: Used to display historical executed commands in the form of:[-c]

[Email protected] ~]# history

...

History

If you use the parameter-C, the history will be saved to the ". Bash_history" File (save 1000 by default)

linux[Basic]-06--System State Detection command [01]