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How to use lsof command in Linux ?

How to use lsof command in Linux ?

The lsof command is a powerful and useful tool for analyzing open files, ports, and processes in Linux. It allows users to view information about files that are in use, as well as the processes and users that are utilizing them. 

Here at Fixwebnode, we shall look into the basics of using lsof in Linux.

 

How to use lsof ?

Lsof stands for "list of open files" and is a command line tool used to view information about open files, ports, and processes in Linux. It can be used to view information about the user that is using the file, the process that is using it, and the file name. It can also be used to find out what ports a process is using, or what files a process has open.

The basic syntax for using lsof is as follows:

$ lsof [options] [files or processes]

 

lsof command Options

There are many options that can be used with lsof, depending on the type of information you are trying to view. Here are a few of the most commonly used options:

  • -u: View information about a specific user
  • -p: View information about a specific process
  • -c: View information about a specific command
  • -i: View information about a specific port
  • -n: View information about a specific file

 

 

Practical Examples of using lsof command

1. View Information About a Specific User: 
$ lsof -u username

This command will display information about all the open files, ports, and processes being used by the user specified.

 

2. View Information About a Specific Process: 
$ lsof -p pid

This command will display information about all the open files, ports, and processes being used by the specified process.

 

3. View Information About a Specific Command: 
$ lsof -c command

This command will display information about all the open files, ports, and processes being used by the specified command.

 

4. View Information About a Specific Port: 
$ lsof -i port

This command will display information about all the open files, ports, and processes being used by the specified port.

 

5. View Information About a Specific File: 
$ lsof filename

This command will display information about all the open files, ports, and processes being used by the specified file.

 

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CONCLUSION

This article covers using lsof and the different options available. In fact, The lsof command is a powerful and useful tool for analyzing open files, ports, and processes in Linux.

 

How to fix "lsof Command Not Found" Error in Linux ?

If you are a Linux user, you may have encountered the “lsof command not found” error while trying to run the lsof command. The lsof command stands for “list open files”, and it is a useful tool for troubleshooting and monitoring the open files and network connections of a Linux system.

Fortunately, the "lsof command not found" error is easy to fix. Follow the below steps to resolve this issue:

 

1. Install the lsof package: 

The first step is to install the lsof package, which contains the lsof command. If you are using a Debian-based distribution such as Ubuntu, you can install the package using the apt command:

$ sudo apt install lsof

If you are using a Red Hat-based distribution such as CentOS, you can install the package using the yum command:

$ sudo yum install lsof

 

2. Add the lsof command to your path: 

The next step is to add the lsof command to your system path. This will allow you to execute the lsof command without having to specify its full path.

To do this, open the ~/.bashrc file in a text editor and add the following line to the bottom of the file:

$ export PATH=$PATH:/usr/bin/lsof

This will add the path to the lsof command to your system path.

 

3. Source the bashrc file: 

Once you have added the line to your ~/.bashrc file, you need to source the file to make the changes take effect. To do this, run the following command:

$ source ~/.bashrc

After sourcing the file, you should be able to execute the lsof command without any errors.

 

That's it! With these simple steps, you should be able to resolve the "lsof command not found" error and make the lsof command available on your system.

 


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