Limit the shell execution commands to <x> calls same time.

Usage no npm install needed!

<script type="module">
  import execLimiter from 'https://cdn.skypack.dev/exec-limiter';



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Limit the shell execution commands to calls same time.

:cloud: Installation

# Using npm
npm install --save exec-limiter

# Using yarn
yarn add exec-limiter

:bulb: ProTip: You can install the cli version of this module by running npm install --global exec-limiter-cli (or yarn global add exec-limiter-cli).

:clipboard: Example

// Dependencies
var ExecLimiter = require("exec-limiter");

// Constants
const COMMAND = "sleep 5; date;";

// Create an instance of exec limiter
var el = new ExecLimiter(2);

// #1
el.add("sleep 5", function (err) {
    console.log(err || "Waited 5 seconds for the first time.");

// #2
el.add("sleep", ["7"], function (err) {
    console.log(err || "Waited another 7 seconds but probably I was ran in parallel with the other process.");

// #3
el.add("sleep 5", function (err) {
    console.log(err || "I was ran in parallel with the second process and finished fine.");

// #4
el.add("ls", ["-l"], { ignoreStdout: false }, function (err, stdout) {
    console.log(err || "The spawned 'ls -l' returned:\n" + stdout);

// These will be executed like below:
// Timeline: 0-1-2-3-4-5-6-7-8-9-10-11
//       #1: ==========
//       #2: ==============
//       #3:            ============
//       #4:               ==
// Notice how they run in parallel, but not more than 2 in the same time.

:question: Get Help

There are few ways to get help:

  1. Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
  2. For bug reports and feature requests, open issues. :bug:
  3. For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation


Creates a new instance of ExecLimiter.


  • Number limit: The limit of commands to run same time.


  • ExecLimiter The ExecLimiter instance.

add(command, args, options, callback)

Adds a new command to run in the buffer.


el.add(command, fn); // exec
el.add(command, args, fn); // spawn
el.add(command, options, fn); // exec
el.add(command, args, options, fn); // spawn


  • String command: The command to run as string.
  • Object args: The command arguments as array of strings (optional).
  • Object options: The options passed to the spawn/exec function, but extended with the following fields:
  • ignoreStdout (Boolean): If false, then the stdout output will be stored ant called back.
  • Function callback: The callback function.


  • ExecLimiter The ExecLimiter instance.

:yum: How to contribute

Have an idea? Found a bug? See how to contribute.

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:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

  • gry
  • engine-tools
  • git-stat
  • exec-limiter-cli
  • npmreserve
  • @isysd/gpm
  • gpm

:scroll: License

MIT © Ionică Bizău