TLDR
Enter a command. For example: whoami, git rename branch, mongod.

lsof

 
Lists open files and the corresponding processes. Note: Root privileges (or sudo) is required to list files opened by others. More information: https://manned.org/lsof.
 
  • Find the processes that have a given file open:
     
    lsof {{path/to/file}}
     
  • Find the process that opened a local internet port:
     
    lsof -i :{{port}}
     
  • Only output the process ID (PID):
     
    lsof -t {{path/to/file}}
     
  • List files opened by the given user:
     
    lsof -u {{username}}
     
  • List files opened by the given command or process:
     
    lsof -c {{process_or_command_name}}
     
  • List files opened by a specific process, given its PID:
     
    lsof -p {{PID}}
     
  • List open files in a directory:
     
    lsof +D {{path/to/directory}}
     
  • Find the process that is listening on a local IPv6 TCP port and don't convert network or port numbers:
     
    lsof -i6TCP:{{port}} -sTCP:LISTEN -n -P

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