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lsof

Lists open files and the corresponding processes Note: In most case, you need root privilege (or sudo) because you want to list files opened by other than you.

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 (e.g. to pipe into kill)

lsof -t {{/path/to/file}}

list files opened by user

lsof -u {{username}}

list files opened by command (or process) name (e.x nginx)

lsof -c {{process_or_command_name}}