Linux command logging

Port number 1. View port number

• Use netstat -anp to see those ports being opened. The add parameter '-n ' will convert the application to port display, that is, the address of the number format, such as: nfs->2049, ftp->21, so you can open two terminals, one for each corresponding to the port number of the program
• lsof -i:$PORTView the program that applies the port (the $PORT corresponding port number). Or you can view the file /etc/services , from which you can find the service that corresponds to the port.

2. Close the port

• To disable the port through the Iptables tool, such as:

   sudo  iptables-a input-p tcp--dport $PORT-< Span style= "color: #000000;" >j drop  sudo  iptables-a output-p tcp--dport $PORT-j DROP 

• or When the corresponding application is closed, the port naturally shuts down, such as: kill-9 pid (PID: Process number)

   via NETSTAT-ANP | grep  ssh   There is a display: TCP  0  127.0 . 0.1 : 2121  0.0 . 0.0 :* LISTEN 7546 /ssh   kill -9  7546  

Version number 1. Kernel version

cat /proc/uname -uname -R

2. System version

[Email protected] ~]# lsb_release-cat /etc/cat /etc/redhat-release

3. Number of system bits

 [[email protected] ~]# getconf long_bit #或者 [[email protected] ~]# getconf word_bit[[email protected]  ~]# file /bin/ls  [[email protected]  ~]# lsb_release-a