Steps to install lsof on ubuntu 20.04 LTS

lsof stand for “List Of Open File”,is a command line utility.It provides a list of open files & gives the information to find out the open files by which process.

There are some steps to install lsof on ubuntu:

Step 1: Update the system.

apt-get update

Step 2: Install Isof on system.

apt install lsof

• Check the Isof version.

lsof -v

• Here is the command output.

Step 3: Isof Syntax & Examples:

• To list all open files.

lsof

• Here is the command output.

• To list all processes with open files under a specified directory.

lsof +D /var/log/

• Here is the command output.

• To list all files in a specified user.

lsof -u user-name
lsof -u ubuntu

• Here is the command output.

• To list all open files by using a specific process ID.

lsof -p 1238

• Here is the command output.

• To run lsof command to repeat the command at the specified time interval.

lsof -p 1238 -r5

• Here is the command output.

• To list Network Connections using lsof.

lsof -i

• Here is the command output.

• To list connections on a specific port.

lsof -i:22

• Here is the command output.

lsof -i -a -c ssh

• Here is the command output.

• To list Connections on a range of ports.

lsof -i:22-25

• Here is the command output.

• To Limit the output to either IPv4 or IPv6.

lsof -i4

• Here is the command output.

lsof -i6

• Here is the command output.