I would start with jQuery Ajax.  Sounds like you need jQuery to query a 
PHP script that executes tail and returns the results back to your 
jQuery code where it assembles the log text in a way that can then be 
sent to the DOM element or a text box.  All you need is a trigger to 
keep it refreshing - a button or maybe there is a timer in jQuery that 
will trigger your Ajax script.

On 2015-01-01 13:26, David Schwartz wrote:
> Happy New Year, all!
> 
> I have a general php/scripting question.
> 
> I’ve got a guy working on a php script for me and I want it to create
> a logfile. Piece of cake. The logfile is being created.
> 
> I also want to be able to view the logfile inside of an HTML TEXTBOX
> in a Wordpress admin page. (That’s just context; the question has
> nothing to do with WP at all.)
> 
> In my mind, it’s essentially what you’d get if you did ‘tail -f
> logfilename’ and piped it into a circular buffer that’s displayed in
> an HTML TEXTBOX, using a little javascript to update the contents of
> the TEXTBOX periodically.
> 
> As if the TEXTBOX is just a command shell window that shows the
> results of the ‘tail -f’ command, but you can’t type into it.
> 
> Here’s my question: is it possible to spawn a thread running something
> like rsh to process a ‘tail -f <fname>’ command and take the output
> from that and display it in an HTML TEXTBOX as if it were just typed
> at the command line?
> 
> Note that I don’t need an infinite history, just 100 lines or so.
> 
> Later on I want to add something like a grep filter so it only
> displays lines that match a specific ID, but for now we just need to
> get the log file to show up “live” without causing problems.
> 
> The programmer is having coniption fits trying to write some rather
> complicated php+js code to get this to work, and it’s causing buffer
> overflows with the code managing the TEXTBOX that’s impacting other
> stuff.
> 
> I’m thinking … what’s wrong with just running a ‘tail -f’ command
> through a shell and displaying the results in a web page?
> 
> That’s the beauty of Linux, right?
> 
> Any thoughts?
> 
> -David
> 
> 
> 
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-- 
Keith Smith
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