proc on

Bidirectional port/process lookup.

Port/process lookup — works both ways. Alias: :.

proc on :3000          # what's on port 3000?
proc on node           # what ports is node using?
proc on 1234           # what ports is PID 1234 using?
proc on :3000,:8080    # multiple targets

Every view shows the process’s directory and uptime.

Options

Flag	Short	Description
--in [<dir>]	-i	Filter by directory
--by <name>	-b	Filter by process name
--json	-j	Output as JSON
--verbose	-v	Show full command line

Examples

# what's running on port 3000?
proc on :3000

# what ports is node using? (reverse lookup)
proc on node

# only node processes in current directory
proc on node --in .

# JSON output for scripting
proc on :3000 --json

See also

info for detailed process information, ports to list all listening ports.