51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
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# The `lsof` command
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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`
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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.
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### Syntax:
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```
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lsof [-OPTION] [USER_NAME]
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```
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### Examples:
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1. To show all the files opened by all active processes:
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```
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lsof
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```
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2. To show the files opened by a particular user:
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```
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lsof -u [USER_NAME]
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```
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3. To list the processes with opened files under a specified directory:
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```
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lsof +d [PATH_TO_DIR]
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```
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### Options and their Functionalities:
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|**Option** |**Additional Options** |**Description** |
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|:---|:---|:---|
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|`-i`|`tcp`/ `udp`/ `:port`|List all network connections running, Additionally, on udp/tcp or on specified port.|
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|`-i4`|<center>-</center>|List all processes with ipv4 connections.|
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|`-i6`|<center>-</center>|List all processes with ipv6 connections.|
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|`-c`|`[PROCESS_NAME]`|List all the files of a particular process with given name.|
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|`-p`|`[PROCESS_ID]`|List all the files opened by a specified process id.|
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|`-p`|`^[PROCESS_ID]`|List all the files that are not opened by a specified process id.|
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|`+d`|`[PATH]`|List the processes with opened files under a specified directory|
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|`+R`|<center>-</center>|List the files opened by parent process Id.|
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### Help Command
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Run below command to view the complete guide to `lsof` command.
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```
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man lsof
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```
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