TLDR
Enter a command. For example: lsmod, a2dismod, btrfs version.

fuser

 
Display process IDs currently using files or sockets. More information: https://manned.org/fuser.
 
  • Find which processes are accessing a file or directory:
     
    fuser {{path/to/file_or_directory}}
     
  • Show more fields (USER, PID, ACCESS and COMMAND):
     
    fuser --verbose {{path/to/file_or_directory}}
     
  • Identify processes using a TCP socket:
     
    fuser --namespace tcp {{port}}
     
  • Kill all processes accessing a file or directory (sends the SIGKILL signal):
     
    fuser --kill {{path/to/file_or_directory}}
     
  • Find which processes are accessing the filesystem containing a specific file or directory:
     
    fuser --mount {{path/to/file_or_directory}}

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