Sometimes you want to run something in the OS from your node code but you do not want to follow it or have a callback posted on your stack. The default for child_process spawning is to hold on to a handle and park a callback on the stack. however there is an option which is called detached.
var spawn = require('child_process').spawn;
spawn('/usr/scripts/script.sh', ['param1'], {
detached: true
});You can even setup the environment of the call to add stdio and stderr pipes to the call and connect them to OS fs descriptors like this:
var fs = require('fs'),
spawn = require('child_process').spawn,
out = fs.openSync('./out.log', 'a'),
err = fs.openSync('./err.log', 'a');
spawn('/usr/scripts/script.sh', ['param1'], {
stdio: [ 'ignore', out, err ], // piping stdout and stderr to out.log
detached: true
}).unref();The unref disconnects the process. from the parent it equates to a disown in shell.
Thanks to O/P : https://stackoverflow.com/questions/25323703/nodejs-execute-command-in-background-and-forget
Also Ref: https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options
and
https://github.com/nodejs/node-v0.x-archive/issues/9255
nJoy 😉