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landing/docs/.recycle/.recycle2/068-the-lsof-command.md

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+# The `lsof` command
+
+The `lsof` command shows **file infomation** of all the files opened by a running process. It's name is also derived from the fact that, list open files > `lsof`
+
+An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library , a stream or a network file (Internet socket, NFS file or UNIX domain socket). A specific file or all the files in a file system may be selected by path.
+### Syntax:
+
+```
+lsof [-OPTION] [USER_NAME]
+```
+
+### Examples:
+
+1. To show all the files opened by all active processes:
+
+```
+lsof
+```
+
+2. To show the files opened by a particular user:
+
+```
+lsof -u [USER_NAME]
+```
+
+
+3. To list the processes with opened files under a specified directory:
+
+```
+lsof +d [PATH_TO_DIR]
+```
+
+### Options and their Functionalities:
+
+|**Option**   |**Additional Options**   |**Description**   |
+|:---|:---|:---|
+|`-i`|`tcp`/ `udp`/ `:port`|List all network connections running, Additionally, on udp/tcp or on specified port.|
+|`-i4`|<center>-</center>|List all processes with ipv4 connections.|
+|`-i6`|<center>-</center>|List all processes with ipv6 connections.|
+|`-c`|`[PROCESS_NAME]`|List all the files of a particular process with given name.|
+|`-p`|`[PROCESS_ID]`|List all the files opened by a specified process id.|
+|`-p`|`^[PROCESS_ID]`|List all the files that are not opened by a specified process id.|
+|`+d`|`[PATH]`|List the processes with opened files under a specified directory|
+|`+R`|<center>-</center>|List the files opened by parent process Id.|
+
+### Help Command
+Run below command to view the complete guide to `lsof` command.
+```
+man lsof
+```