javascript - How to read command line output -

javascript - How to read command line output -

i want open batch file in nodejs , read output, while printing (not @ 1 time when batch finished).

for example, jenkins / hudson.

i'm aware work on windows. finish illustration of how helpful, i'm pretty new nodejs.

i believe you'll fine using node's kid process run command , monitor it's output prints. not have restrictions on windows though, may missing in you're asking. allow me explain in hopes answers question.

imagine have file outputs text, on time , not @ once. let's name file print-something.js. (i realize you've spoken batch file, know child_process can execute executable file. here i'll running javascript file via node, execute batch file in same way.)

print-something.js

var maxruns = 5, numruns = 0; function printsomething() { console.log('some output'); settimeout(function() { numruns++; if (numruns < maxruns) { printsomething(); } }, 1000); } printsomething();

it's not of import file does, if study you'll see prints "some output" 5 times, prints each statement 1 sec gap in-between. running command line (via node print-something.js) result in:

some output output output output output

so have file outputs text in delayed manner. turning our attending file reads output, have this:

monitor-output.js

var spawn = require('child_process').spawn, command = spawn('node', ['print-something.js']); command.stdout.on('data', function(data) { console.log('stdout: ' + data); }); command.on('close', function (code) { console.log('child process exited code ' + code); });

this file spawns process node print-something.js, , begins inspect standard output. each time gets data, prints console. finally, when execution has completed, outputs exit code. running node monitor-output.js results in:

stdout: output

stdout: output

stdout: output

stdout: output

stdout: output

child process exited code 0

most won't printing output of file console, that's we're doing here illustration. gives thought on how monitor output of file while runs, , within child_process.

javascript node.js