Running a shell command from Node.js without buffering output

Question

I\'m trying to launch a shell command from Node.js, without redirecting that command\'s input and output -- just like shelling out to a command using a shell script, or

Answer 1

I haven't used it, but I've seen this library: https://github.com/polotek/procstreams

It you'd do this. The .out() automatically pipes to the process's stdin/out.

var $p = require('procstreams');
$p('cat lines.txt').pipe('wc -l').out();

If doesn't support shell syntax, but that's pretty trivial I think.

var command_str = "cat lines.txt | wc -l";
var cmds = command_str.split(/\s?\|\s?/);
var cmd = $p(cmds.shift());
while(cmds.length) cmd = cmd.pipe(cmds.shift());
cmd
  .out()
  .on('exit', function() {
    // Do whatever
  });