# lsof - list open files

Lists open files and the corresponding processes.
Note: Root privileges (or sudo) is required to list files opened by others.

- 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 TCP port:
    `lsof -iTCP:port -sTCP:LISTEN`

**Find all LISTEN process**

```
lsof -Pi | grep -i listen
```