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lsof

Lists open files and the corresponding processes. Note: In most cases, you need root privilege (or use sudo) because you want 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 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 the given PID:

lsof -p {{PID}}