I'm trying to do this /usr/bin/gzip -p /home/mysite/public_html/shop/feeds/myfile.xml.zip > /home/mysite/public_html/shop/feeds/myfile.xml But it just tells me /usr/bin/gzip: invalid option -- p X-Powered-By: PHP/5.2.5 Content-type: text/html How do I find the correct option to unzip first file to second file?