title: Pkill -f doesn't work for process killing
body: <p>I have this process running:</p>
  
  <pre><code>342 pts/2    T    0:00 sh -c sudo screen /usr/bin/python /usr/bin/btdownloadcurses "http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent" --display_interval 20 --saveas "/srv/"
  343 pts/2    T    0:00 sudo screen /usr/bin/python /usr/bin/btdownloadcurses http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent --display_interval 20 --saveas /srv/
  344 pts/2    T    0:00 screen /usr/bin/python /usr/bin/btdownloadcurses http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent --display_interval 20 --saveas /srv/
  </code></pre>
  
  <p>I tried to run: </p>
  
  <pre><code>pkill -f http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent
  </code></pre>
  
  <p>But the process still running.<br>
  How do I force kill the processes that contain: "<a href="http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent" rel="noreferrer">http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent</a>" ?</p>
  
  <hr>
  
  <p><strong>Question as edited below:</strong></p>
  
  <pre><code>ps ax | grep 'Momomoko.E01.140011.HDTV.H264.720p.mp4'
  </code></pre>
  
  <p>I want to kill all process that contain the above string.</p>
  
  <p>I tried running the above line, and it returns three results:</p>
  
  <pre><code>  342 pts/2    T    0:00 sh -c sudo screen /usr/bin/python /usr/bin/btdownloadcurses "http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent" --display_interval 20 --saveas "/srv/Momomoko.E01.140011.HDTV.H264.720p.mp4"
    343 pts/2    T    0:00 sudo screen /usr/bin/python /usr/bin/btdownloadcurses http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent --display_interval 20 --saveas /srv/Momomoko.E01.140011.HDTV.H264.720p.mp4
    344 pts/2    T    0:00 screen /usr/bin/python /usr/bin/btdownloadcurses http://zoink.it/torrent/732A4A9B54B7E3A916C2835D936D985942F65A6D.torrent --display_interval 20 --saveas /srv/Momomoko.E01.140011.HDTV.H264.720p.mp4
  </code></pre>
  
  <p>How do I run this line: </p>
  
  <pre><code>ps ax | grep 'Momomoko.E01.140011.HDTV.H264.720p.mp4'
  </code></pre>
  
  <p>..with php, and <code>kill -9</code> all the matching processes?</p>