[OT] Magic numbers

[Lisi <lisi.reisz@gmail.com>]

I need to find out:
a)What the magic number should be for certain types of file and
b)Whether a specific file of that type has the correct magic number.

Here is my one, so far futile, effort - in addition to googling until I can 
see magic numbered smoke coming out of my ears. :-(

lisi@Tux:~$ cat /usr/share/misc/magic.mgc | grep gzip
Binary file (standard input) matches
lisi@Tux:~$ 

I realise that this is more specific to UNIX than specific to Debian - but it 
applies to all the UNIX family, and Debian is part of that family. ;-)

Thanks,
Lisi