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Top Forums UNIX for Dummies Questions & Answers Magic numbers '&' operator problem Post 302536538 by segmentation on Tuesday 5th of July 2011 04:46:50 PM
Old 07-05-2011
Sorry, I do not understand functionality of ^ operator by this sentences
" "^0x1" means low order bit must be 0 "

I posted above and will write again clearly.

In my magic.mime there is only one line
"0 byte ^0xd3 file\ detected"

and in my test file named myfile, the first byte is 0xb1.

0xd3 = 11010011
0xb1 = 10110001

when I write 'file -m magic.mime myfile'
it prints "file detected".

According to your explanation there should be 0 bits on testing byte corresponding 1 bits in magic.mime but in example above there is nothing like that.
 

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update-mime-database(1) 					   User Commands					   update-mime-database(1)

NAME
update-mime-database - build the shared MIME_Info database cache SYNOPSIS
update-mime-database -h | -v | mime-dir DESCRIPTION
update-mime-database updates the shared mime-info cache according to the system described in the Shared MIME-Info Database specification from the X Desktop Group. OPTIONS
The following options are supported: -h Display a command summary. -v Display version information OPERANDS
The following operands are supported: MIME-dir The directory for which update-mime-database should rebuild the cache. This option is mandatory if no other option is pro- vided. EXAMPLES
Example 1: Update Shared mime-info Cache for /usr/share example% update-mime-database /usr/share ENVIRONMENT VARIABLES
See environ(5). EXIT STATUS
The following exit values are returned: 0 Application exited successfully >0 Application exited with failure FILES
The following files are used by this application: /usr/bin/update-mime-datExecutable to build the shared MIME_Info database cache ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-vfs | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
Latest version of the GNOME Desktop User Guide for your platform. gnome-vfs-mime-magic(4), gnome-vfs.applications(4), gnome-vfs.keys(4), gnome-vfs.mime(4) Shared mime info at http://www.freedesktop.org. NOTES
Original man page written by Filip Von Raemdonck (mechanix@debian.org). Updated by Matt Keenan, Sun Microsystems Inc., 2004. SunOS 5.10 6 Sep 2004 update-mime-database(1)
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