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A simple CLI tool for ensuring that a given script runs continuously (i.e. forever).


Installing npm (node package manager)

  curl | sh

Installing http-agent

  [sudo] npm install forever


There are two distinct ways to use forever: through the command line interface, or by requiring the forever module in your own code.

Using forever from the command line

You can use forever to run any kind of script continuously (whether it is written in node.js or not). The usage options are simple:

  usage: forever [FILE, ...] [options]

    -m MAX            Only run the specified script MAX times
    -s, --silent      Run the child script silencing stdout and stderr
    -h, --help        You're staring at it

There are several samples designed to test the fault tolerance of forever. Here's a simple example:

  forever samples/error-on-timer.js -m 5

Using forever from node.js

You can also use forever from inside your own node.js code.

  var forever = require('forever');
  var child = new (forever.Forever)('your-filename.js'), {
    max: 3,
    silent: true,
    options: []
  child.on('exit', this.callback);;

Each forever object is an instance of the node.js core EventEmitter. There are several core events that you can listen for:

  • restart [err, forever]: Raised each time the target script is restarted
  • exit [err, forever]: Raised when the call to completes
  • stdout [err, data]: Raised when data is received from the child process' stdout
  • stderr [err, data]: Raised when data is received from the child process' stderr

Run Tests

  vows test/*-test.js --spec

Author: Charlie Robbins;

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