Linux system software information kernel, system, directory, firewall, etc.

View Kernel version

Uname-r

Uname-a

To view the current Linux system version:

Cat/etc/redhat-release

To view the size of a directory

Du/home-sh

#env View Environment variables

#lsmod View kernel-loaded service modules

#du-sh usr to view the size of the specified directory

#uptime View System uptime, number of users, load

[Email protected]/]# uptime

17:42:08 up, 6:47, 1 user, load average:0.01, 0.02, 0.05

Internet

IFCONFIG-A View all network interface properties

Iptables-l View firewall rules (before CENTOS7)

Firewall-cmd--list-all View firewall settings (CENTOS7)

Route-n Viewing the routing table

NETSTAT-LNTP View all monitored ports

NETSTAT-ANTP View all established connections

Netstat-s Viewing network statistics

User:

W View Active Users

ID < user name > View information such as specified user information uid,gid,groups

Last View user logon log

Cut-d:-F1/ETC/PASSWD View all users of the system

Cut-d:-f1/etc/group View System all groups

Crontab-l checking the current user's scheduled tasks

Service:

Chkconfig--list

Chkconfig--lies |grep xx (before CENTOS7)

Systemctl list-units--type=service Service Information Simple list

Systemctl status XX

Systemctl Status |grep XX

Service XX Status

To view the current RunLevel:

Who-rh

RunLevel

The system information that can be viewed in the/proc directory is:

Cpuinfo

Filesystems File System Information

DMA Host DMA Channel information

Interrupts host interrupt Information

Ioprots host I/O port information

Meminfo Memory Information

Ersion Linux Memory version information

Linux system software information cores, systems, directories, firewalls, etc.