what's on port 3000?

proc on :3000

kill it

proc kill :3000

free the port (kill + verify)

proc free :3000

why is this port busy?

proc why :3000

node processes in this directory

proc by node --in .

wait for it to finish

proc wait node

before / after

task	without proc	with proc
what's on port 3000?	`lsof -i :3000 -P -n`	`proc on :3000`
kill it	`lsof -i :3000 -t \| xargs kill -9`	`proc kill :3000`
free the port	`lsof -t -i:3000 \| xargs kill && sleep 1 && lsof -i:3000`	`proc free :3000`
wait for process	`while ps aux \| grep node \| grep -v grep; do sleep 5; done`	`proc wait node`
find orphans	no standard tool	`proc orphans`
pause a process	`kill -STOP $(pgrep node)`	`proc freeze node`

commands

discovery

proc on :3000 what's on this port?

proc by node find by name

proc for ./app.js what's running this file?

proc in . processes in this directory

proc why :3000 trace ancestry

proc orphans find abandoned processes

proc ports all listening ports

proc tree process hierarchy

lifecycle

proc kill :3000 force kill

proc stop node graceful shutdown

proc free :3000 kill + verify port freed

proc freeze node pause (SIGSTOP)

proc thaw node resume (SIGCONT)

proc wait node block until exit

composable

targets work everywhere: :port, PID, name. comma-separate for multiple. add --in . to scope to current directory. add --json for structured output.

proc kill :3000,:8080,node --in . --json --yes

full command reference →

install

macOS

brew install yazeed/proc/proc

npm / bun

npm install -g proc-cli

rust

cargo install proc-cli

shell

curl -fsSL https://raw.githubusercontent.com/yazeed/proc/main/install.sh | bash

all platforms →