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POError running example code in a serialized loop
 

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    <p>I have been tinkering around with node a little, and while trying to learn the child_process module, I ran into a problem. I was attempting to serialize many calls to 'ps -eF | grep ssh', but it crashes on my system with the error below. So two questions. First, is there a better way to do what I am attempting without a library? Second, why isn't it working :)</p> <pre><code>events.js:71 throw arguments[1]; // Unhandled 'error' event ^ Error: This socket is closed. at Socket._write (net.js:519:19) at Socket.write (net.js:511:15) at Socket.&lt;anonymous&gt; (/home/me/tmp/test.js:10:16) at Socket.EventEmitter.emit (events.js:96:17) at Pipe.onread (net.js:397:14) </code></pre> <pre><code>function callpsgrep(callback) { var spawn = require('child_process').spawn, ps = spawn('ls', ['-la']), grep = spawn('grep', ['bananas']); ps.stdout.on('data', function (data) { grep.stdin.write(data); }); ps.stderr.on('data', function (data) { console.log('ps stderr: ' + data); }); ps.on('exit', function (code) { if (code !== 0) { console.log('ps process exited with code ' + code); } grep.stdin.end(); }); grep.stdout.on('data', function (data) { console.log('' + data); }); grep.stderr.on('data', function (data) { console.log('grep stderr: ' + data); }); grep.on('exit', function (code) { if (code !== 0) { console.log('grep process exited with code ' + code); } callback(); }); } function series(i) { if (i &lt; 1000) { callpsgrep( function() { return series(i+1); }); } } series(0); </code></pre>
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