node.js how to check a process is running by the process name?

Question

i run node.js in linux, from node.js how to check if a process is running from the process name ? Worst case i use child_process, but wonder if better ways ?

Thanks !

Answer 1

You can use the ps-node package.

https://www.npmjs.com/package/ps-node

var ps = require('ps-node');  // A simple pid lookup  ps.lookup({     command: 'node',     psargs: 'ux'     }, function(err, resultList ) {     if (err) {         throw new Error( err );     }      resultList.forEach(function( process ){         if( process ){             console.log( 'PID: %s, COMMAND: %s, ARGUMENTS: %s', process.pid, process.command, process.arguments );         }     }); }); 

I believe you'll be looking at this example. Check out the site, they have plenty of other usages. Give it a try.

Just incase you are not bound to nodejs, from linux command line you can also do ps -ef | grep "YOUR_PROCESS_NAME_e.g._nodejs" to check for a running process.

Answer 2

A little improvement of code answered by d_scalzi. Function with callback instead of promises, with only one variable query and with switch instead of if/else.

const exec = require('child_process').exec;  const isRunning = (query, cb) => {     let platform = process.platform;     let cmd = '';     switch (platform) {         case 'win32' : cmd = `tasklist`; break;         case 'darwin' : cmd = `ps -ax | grep ${query}`; break;         case 'linux' : cmd = `ps -A`; break;         default: break;     }     exec(cmd, (err, stdout, stderr) => {         cb(stdout.toLowerCase().indexOf(query.toLowerCase()) > -1);     }); }  isRunning('chrome.exe', (status) => {     console.log(status); // true|false })