How to parse output of stdout

Question

For example if execute in nodejs child process something like:

exec("find /path/to/directory/ -name '*.txt'", callback);

How can i parse the streamed output in my callback function to an array to get something like so?

['file-1.txt', 'file-2.txt', 'file-3.txt', ...]

The current output is like following:

path/to/file-1.txt
path/to/file-2.txt
path/to/file-3.txt

Thanks for helping

function callback(error, stdout, stderr) { ... } The returned output looks like so: path/to/file1.txt path/to/file1.txt — Allan Bachmann
– Allan Bachmann, Commented Nov 11, 2017 at 15:52
The returned output of the callback looks like so: path/to/file1.txt <br/> path/to/file2.txt <br/> path/to/file3.txt — Allan Bachmann
– Allan Bachmann, Commented Nov 11, 2017 at 15:59
This might help you-- stackoverflow.com/questions/33196261/… — wrangler
– wrangler, Commented Nov 11, 2017 at 16:03

Luca Borrione · Accepted Answer · 2017-11-11 21:09:13Z

2

const exec = require('child_process').exec;
exec("find /path/to/directory -name '*.txt'", (error, stdout, stderr) => {
    if (error) {
        // handle error
    } else {
        var fileNames = stdout.split('\n').filter(String).map((path) => {
            return path.substr(path.lastIndexOf("/")+1);
        });
        console.log(fileNames); // [ 'file1.txt', 'file2.txt', 'file3.txt' ]
    }
});

or

const exec = require('child_process').exec;
exec("ls /path/to/directory | grep .txt", (error, stdout, stderr) => {
    if (error) {
        // handle error
    } else {
        var fileNames = stdout.split(/[\r\n|\n|\r]/).filter(String);
        console.log(fileNames); // [ 'file1.txt', 'file2.txt', 'file3.txt' ]
    }
});

answered Nov 11, 2017 at 21:09

Luca Borrione

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