Node.JS - want to move output off console into log/err files

Question

Can someone give me a hand with converting the following code from console output to file output? I'm struggling with logging and the asynchronous nature of Node. The script works great in a console, but I'd like to pipe the sorted output into individual server sections within a file with STDERR going to another file.

var rexec = require('remote-exec');
var fs = require('fs');
var lineReader = require('line-reader');
var streamBuffers = require('stream-buffers');

var _ = require('lodash');

var conn_options = {
  port: 22,
  username: '*****',
  privateKey: fs.readFileSync('R:/nodeJS/sshkey.priv')
}

// something that dumps out a bunch of data...
var cmds = ['df']
var filename = 'servers.txt';

lineReader.eachLine(filename,function(line,last,cb){

    var buffer = new streamBuffers.WritableStreamBuffer();

    var my_conn_options = _.clone(conn_options);


    rexec(line,cmds,my_conn_options,function(err){
        if (err) {
            console.log(line, err);
        } else {
            console.log('>>>> Start: ' + line + '<<<<')
            console.log(buffer.getContentsAsString());
            console.log('>>>> End: ' + line + '<<<<')
        };

    });
    if (last) {
        cb(false); // stop reading
    } else {
        cb();
    }
});

fernando · Accepted Answer · 2016-08-24 16:22:02Z

1

check this example, that should help..

var fs = require('fs');
var util = require('util');
var logFile = fs.createWriteStream('log.txt', { flags: 'a' });
  // Or 'w' to truncate the file every time the process starts.
var logStdout = process.stdout;

console.log = function () {
  logFile.write(util.format.apply(null, arguments) + '\n');
  logStdout.write(util.format.apply(null, arguments) + '\n');
}
console.error = console.log;

answered Aug 24, 2016 at 16:22

fernando

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