Output remote server stream bash file with line breaks on page PHP

Question

I am attempting to output a remote bash file onto a page so the user can see what is happening. I am able to read the bash file, however, anything I try it isn't adding a newline between each echo statements. Does anyone know how to do this?

Here is my bash file:

scirpt.sh

#!/bin/bash

echo 'touch /tmp/testfile'."\n"
echo "I am up\n"
echo '\n'
echo "\n"
echo
echo 'hello there'

Here is my php logic:

main.php

if(isset($_POST['option']) && $_POST['option'] == 1) { 
                $stream = ssh2_exec($connection, "/tmp/user/testscripts/up.sh");
                stream_set_blocking($stream, true);
                $stream_out = ssh2_fetch_stream($stream, SSH2_STREAM_STDIO);
                $output = stream_get_contents($stream_out);

           }
....
....
....

<div class="box1">
  <form method="post">
    <label class="col">Up/Down</label>
    <span class="col">
      <input type="radio" name="option" id="r1" value="1" />
      <label for="r1">Up</label>
      <input type="radio" name="option" id="r2" value="2" />
      <label for="r2">Down</label> 
    </span>
    <span class="col">
      <input type="submit" class="button"/>
    </span>
  </form>

  <?php
    echo "<pre>$output</pre>"
  ?>

Here is my output on the page:

touch /tmp/testfile.\\n I am in up\\n \\n \\n hello there

Answer 1

When you echo something you'll get a literal version of it. C-style \\n isn't an option.

Two options. The first is:

echo 'touch /tmp/testfile'
echo 'I am up'
echo
echo
echo
echo 'hello there'

Section option is a HEREDOC supplied to cat :

cat <<END
touch /tmp/testfile
I am up


hello there
END

Answer 2

bash echo appends a newline unless suppressed with -n , so don't include them. There is a -e option to have echo interpret escaped characters but you don't need that here.

Also, to display on a web page (HTML) you will need to wrap in <pre></pre> tags or use the PHP nl2br() .

So use:

echo 'touch /tmp/testfile'
echo 'I am up'
echo
echo
echo
echo 'hello there'

Or:

echo 'touch /tmp/testfile
I am up


hello there'

HTML doesn't render newlines so this treats it as pre-formatted text that will:

echo '<pre>' . stream_get_contents($stream_out) . '</pre>';

Or convert the newlines to the HTML <br> tags:

echo nl2br(stream_get_contents($stream_out));