Escaping quotes in a PHP script using ssh2_exec

Question

I need some help with escaping the quotes in this script, I have code above and below, but it does not pertain to this because if I just issue a screen -d -m -S minecraft, it creates one fine. Any help would be amazing because i've been trying for an hour now, Thanks!

 if (!($stream = ssh2_exec($con, 'screen -d -m -S minecraft -p 0 -X stuff "\printf "\say This is a test.\r"\"\' ))) {
        echo "fail: unable to execute command\n";
    } else {
        // collect returning data from command
        stream_set_blocking($stream, true);
        $data = "";
        while ($buf = fread($stream,4096)) {
            $data .= $buf;
        }
        echo $data;
        fclose($stream);
    }

If you aren't using a text editor with syntax highlighting yet, this is the time. — mario, Apr 19 '12 at 01:56

score 1 · Accepted Answer · answered Apr 19 '12 at 01:53

1

Shouldn't the \ should go before the ". Also, from your description, it sounds like that you only want to run "screen -d -m -S minecraft" and it looks like you have an extra printf in there.

if (!($stream = ssh2_exec($con, "screen -d -m -S minecraft")))

http://php.net/manual/en/language.types.string.php

answered Apr 19 '12 at 01:53

David Z.

5,621
2
20
13

Thank you! That worked, kinda? It atleast runs my php script now, but returns me the following error: No screen session found. – Jeremy Sayers Apr 19 '12 at 01:56
I want to send a command to the screen when I first create it, something simple like "free -m" to find out if it works first would be great, because it's not working for me – Jeremy Sayers Apr 19 '12 at 01:59
That sounds like the ssh connection worked but screen is giving you an error back. Are you sure your arguments are correct. Can you try adding "-p 0 -X" at the end of the string to see if that changes anything? – David Z. Apr 19 '12 at 02:00
You can send another command by running ssh2_exec again. So you can try running ssh2_exec($con, "free -m") afterwards, but that sounds like a different issue to the string escaping question. – David Z. Apr 19 '12 at 02:02
When I added just "-p 0 -X" to the end it said Please specify a command. I want to be able to create a screen and execute a command to it right away, and then later be able to access the screen and send commands to it also – Jeremy Sayers Apr 19 '12 at 02:06
I'm not a screen expert but looking at the usage, isn't the command (i.e. start top) "screen -d -m -S mysession top" and then to resume you can run "screen -R mysession". Where mysession is a friendly name that you give for the session. – David Z. Apr 19 '12 at 02:14
So that worked! With just the top but when I tried to do a command with an argument "free -m" it did not create the session – Jeremy Sayers Apr 19 '12 at 02:22
Try "screen -d -m -S mysession \"free -m\"" – David Z. Apr 19 '12 at 02:26
Hmmm didnt seem to do anything, I did: if (!($stream = ssh2_exec($con, "screen -d -m -S mysession \"free -m\"" ))) { – Jeremy Sayers Apr 19 '12 at 02:33

score 0 · Answer 2 · edited Jul 19 '12 at 19:03

0

You only need to change "\ to \".

edited Jul 19 '12 at 19:03

prolink007

33,872
24
117
185

answered Apr 19 '12 at 01:56

Shaikh Farooque

2,620
1
19
33

Escaping quotes in a PHP script using ssh2_exec

2 Answers2