Run Shell command in JS

[NataliaKazakiev]

Hey everyone! Does anybody knows function like os.system(command) to run shell command in JavaScript?

[SharkCoding]

Check out the child_process module.

[NataliaKazakiev]

I make a function to run any command in shell with child_proccess:

const { spawn,execFile } = require('child_proccess')

const system = (command) => {
    spawn("touch",[__dir+"spawn.sh"])
    spawn("write",[command,__dir+"spawn.sh"])
    execFile(__dir+"spawn.sh", (error,stdout,stderr) => {
        console.log(stdout)
      })
    spawn("rm",[__dir+"spawn.sh"])
}

[SharkCoding]

Could you just do this?

const { exec } = require("child_process");

const system = (command) => {
    exec(command, (err, stdout, stderr) => {}); 
}

Or if you wanted to be able to get the output from the function, do this.

const { exec } = require("child_process");

const system = (command) => {
    return new Promise((resolve, reject) => {
        exec(command, (err, stdout, stderr) => {
            if (err) reject(err);
            else resolve(stdout);
        });
    });
}

[NataliaKazakiev]

Thanks. But I have a question: exec() function takes 2 arguments or 2rd argument is optional?

[SharkCoding]

I think it is optional so the first one could be condensed into just this

const { exec } = require("child_process");

// kinda redundant
const system = (command) => exec(command);
system("echo Hello World!");
// instead I would just use the default exec command like this
exec("echo Hello World!");

[NataliaKazakiev]

Ok, now I know how to run shell commands in JS. Thanks!