System Information and Operation status acquisition

System type
Uname-o
System version
Cat/etc/issue
Number of system bits
Uname-a
System kernel
Uname-r
Host Name
Hostname, UNAME-N, Echo $HOSTNAME
Intranet IP
Hostname-i
Public network IP
Curl-s
System DNS
cat/etc/resolv.conf | Grep-e "\<nameserver[]+" |awk ' {print $NF} '
Test network
Ping-c www.baidu.com &>/dev/null && echo "internet:connected" | | echo "Internet:disconnected"
Number of current user logins
Who, W

Analyze the operating state of the system
Free-m
Total used free shared buffers Cached
mem:3831 3347 484 34 194 2668
-/+ buffers/cache:483 3348
swap:4094 0 4094
Cached cache is used primarily for open file least use principle (LRU)
Buffers sub-cache is mainly used for the first-in-and-out policies of directory entries, inode nodes, etc.

Cat/proc/meminfo
Memtotal Total Memory
Memfree Memory Usage Memory
System memory
awk '/memtotal/{total=$2}/memfree/{free=$2}end{print (tolal-free)/1024} '/proc/meminfo

CPU Load
Top-n 1-b | grep "Load average:" |awk ' {print $ $13 $14} '

Hard Drive information
Df-h
Filesystem Size used Avail use% mounted on
/dev/sda2 9.8G 4.3G 5.0G 46%/
Tmpfs 1.9G 0 1.9G 0%/dev/shm
/DEV/SDA1 380M 78M 282M 22%/boot
/dev/sda3 18G 1.6G 15G 10%/data

Filesystem Disk device Name
Size Device Total
Used already used capacity
Avail Usable capacity
Use% Usage Capacity Percentage
Mounted on device mounted system catalog file
DF-HP | Grep-v Filesystem | awk ' {print $ ' "$"

System Information and Operation status acquisition