Re: pecl-ssh2 and remote command execution

Chris napsal(a):

Radek Hladik wrote:

Hi,

    I need to run remote command (by ssh), send it some data and receive its output and return value. I could run command like
ssh user@server 'command' via proc_open or something like that. But I've discovered ssh2 pecl-extension and I liked the idea of using ssh directly from PHP. However I was not able to figure out, how to close input stream and how to obtain return value. I.e. let's have this code:

$stream = ssh2_exec($connection,"head -n 4"); stream_set_blocking($stream, true); fputs ($stream,"line1\nline2\n"); while($o=fgets($stream)){ echo $o.'<br>';} fclose ($stream); The problem is that this one never ends as 'head -n 4' waits for two more lines as it does not know, that I've finished sending data. If I close the stream after sending two lines, then I can not get output (of course :-) ). I've tried sending chr(3), chr(4), chr(0) to indicate end of input but nothing works.

head will sit there waiting forever until you send another 2 lines - try it in your ssh session. Send 4 lines: line 1\n line 2\n \n \n and you'll get what you want.

Thanks for your reply. I know that head will wait till it receives 4 lines but it should also end when its input stream gets closed. That's why I've choosed head for my example. If I use proc_open on local head then I can selectively close its input and still get its output. In real use I will use commands which need input to be closed like sed, cat, etc.... For simplicity imagine this example: (I know this is stupid, but it's just an example :-) ) $stream = ssh2_exec($connection,"tac"); How can I signal to tac that input is over? In shell I would hit ctrl+d (chr(4)) Radek