Share a script for viewing CentOS system information

I recently read "Practical Linux Shell programming and Server Management" and practiced it. When I saw sed and awk, I felt that these two tools were really useful. After learning to use it, I want to see the system information at ordinary times. I always want to check the command and find it in a pile of information. It is better to write a script to train the trainer, so I have the InfoView4CentOS script.

Code hosting is also coming to practice using Github on Github), address: https://github.com/callmepeanut/InfoView4CentOS

You can view the ip address, hardware, and other information in the menu. The running effect is as follows:

[root@localhost InfoView4CentOS]# ./InfoView4CentOS.sh1) HostIp                 3) SystemVersion          5) NonDefault-LoginUsers2) HardwareInfo           4) OpenPorts              6) ExitPlease input your choice:

1) view IP Address

Please input your choice:1===============NetworkInfo===============Host ip is: 10.0.2.15Please input your choice:

2) view CPU, memory, hard disk space, network card, and other information

Please input your choice:2===============HardwareInfo===============ProductName: VirtualBoxCPU:         Intel(R) Pentium(R) Dual  CPU  E2140  @ 1.60GHzPhysicMem:   801408 kBDiskSpace:   12G 25%usedNetWorkCard: PCnet/PCI II 79C970APlease input your choice:

3) view the system and kernel version

Please input your choice:3===============SystemInfo===============Release:         release 6.4 (Final)Kernal Version:  2.6.32-358.el6.i686System Bits:     32 BitPlease input your choice:

4) view port opening status

Please input your choice:4===============OpenPortsInfo===============OpenPorts:  127.0.0.1:9000    1430/php-fpm    0.0.0.0:3306     1656/mysqld     0.0.0.0:139       1771/smbd     0.0.0.0:111    1103/rpcbind      0.0.0.0:80      1423/nginx      0.0.0.0:22       1815/sshd   127.0.0.1:631      1292/cupsd    127.0.0.1:25     1753/master     0.0.0.0:445       1771/smbd   0.0.0.0:46943  1187/rpc.statd   127.0.0.1:199      1416/snmpd          :::139       1771/smbd          :::111    1103/rpcbind           :::22       1815/sshd         ::1:631      1292/cupsd        :::60826  1187/rpc.statd          :::445       1771/smbd

5) view non-default shell users

Please input your choice:5===============UsersInfo===============peanut:x:500:500:peanut:/home/peanut:/bin/bashmysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bashseg:x:502:502::/home/seg:/bin/bashPlease input your choice:

6) quit

Please input your choice:6Bye

Input error

Please input your choice:aBad ChoicePlease input your choice: