Interesting .. looks like *nix 'file' command reads from start to end, so it detects it as JPG.<p>[09:55:38] jliew@ssdstrdev1:~/malcode
$ file some.jpg<p>some.jpg: JPEG image data, JFIF standard 1.01<p>[09:55:45] jliew@ssdstrdev1:~/malcode
$ file some.zip<p>some.zip: Zip archive data, at least v2.0 to extract<p>[09:55:47] jliew@ssdstrdev1:~/malcode
$ cat some.jpg some.zip &#62; concat<p>[09:57:14] jliew@ssdstrdev1:~/malcode
$ file concat<p>concat: JPEG image data, JFIF standard 1.01<p>[09:57:21] jliew@ssdstrdev1:~/malcode
$ whatis file<p>file (1)             - determine file type