On Aug 18, 2013, at 5:52 PM, Mark Hahn <[email protected]> wrote:
> When I run this bash script ...
>
> #!/bin/bash
> tail -f log &
> echo "tail is working" >> log
>
> it prints out "tail is working" as expected.
>
> My question is how can I do the same thing with a node command-line script?
> I've tried everything but I can't come up with anything that works. Most of
> my tries hang with the child_process never returning.
>
> By node command-line script I mean a file like this ...
>
> #!/usr/bin/env node
> console.log "I'm a command-line script”
>
Are you expecting to see “tail is working” (or the equivalent) on the terminal?
I am not entirely comfortable with Node’s child_process (in comparison to Unix
fork/popen) but the documentation does say it is the equivalent of popen, so
‘stdout’ is not going to go to the terminal/tty (assuming you are using *nix).
So, if you have:
var spawn = require(‘child_process’).spawn,
tail = spawn(‘tail’, [‘-f’, ‘log’]);
Then, ostensibly(*) ‘tail.stdout’ will give you the stuff that is being added.
I assume you are watching the file like this, using ’tail -f’, for some reason,
rather than using some tail module.
—ravi
(*) I am speaking generally here since I do not know exactly how you are
spawning the child and how the file content is being modified.
>
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