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This is our on-going series of Linux commands and in this article we are going to review lsof command with practical examples. lsof meaning ‘LiSt Open Files’ is used to find out which files are open by which process. As we all use lsof command is when a disk cannot be unmounted as it says the files are being used. With the help of this command we can easily In the below example, it will show long listing of open files some of them are extracted for better understanding which displays the columns init         1      root   3r     FIFO        0,8       0t0       8449 pipe init         1      root   4w     FIFO       0,8       0t0       8449 pipe init         1      root   5r      DIR       0,10         0          1 inotify init         1      root   6r      DIR       0,10         0          1 inotify Sections and it’s values are self-explanatory. However, we’ll review FD & TYPE columns more precisely. FD – stands for File descriptor and may seen some of the values as: Also in FD column numbers like 1u is actual file descriptor and followed by u,r,w of it’s mode as: The below command will display the list of all opened files of user tecmint. To find out all the running process of specific port, just use the following command with option -i. The below example will list all In below example shows only IPv4 and IPv6 network files open with separate commands. To list all the running process of open files of TCP Port ranges from 1-1024. master  1551    root   13u  IPv6  12898      0t0  TCP localhost:smtp (LISTEN) sshd    1834    root    3r  IPv4  15101      0t0  TCP 192.168.0.2:ssh->192.168.0.1:conclave-cpp (ESTABLISHED) sshd    1838 tecmint    3u  IPv4  15101      0t0  TCP 192.168.0.2:ssh->192.168.0.1:conclave-cpp (ESTABLISHED) sshd    1871    root    3r  IPv4  15842      0t0  TCP 192.168.0.2:ssh->192.168.0.1:groove (ESTABLISHED)