07-21-2012
Quote:
Originally Posted by
jim mcnamara
file command uses (/etc/magic or /usr/share/magic or /usr/share/file/magic) and reads the first few bytes of the file. It then tries to decode The first n bytes and then does a lookup on those bytes in the magic file. The text you see is in the magic file.
The size of n depends on the OS.
But I can't find where tell "2.6.16"
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file(1) General Commands Manual file(1)
Name
file - determine file type
Syntax
file [ -c ] [ -f ffile] [ -m mfile] filename ...
Description
The command performs a series of tests on each filename argument in an attempt to classify it. If an argument appears to be ASCII, the
command examines the first 1024 bytes and tries to guess its language.
For character special files, part of this classification is information about which devices the system shows as active. In particular,
device-specific information such as controller type and unit, device type and unit, and status (offline, write locked, density, errors) is
returned. The general categories currently implemented are disk, tape, and terminal devices. The supported terminal devices include Local
Area Terminals (LAT) but not Local Area Network (LAN) pseudo-terminals.
The command uses the file to identify files that have some sort of magic number. A magic number is any numeric or string constant that
identifies the file containing the constant. Commentary at the beginning of explains its format.
Options
-c Checks the magic file for format errors by printing the internal representation of the magic file. No file typing is done under -c.
-f Interprets the following argument to be a file containing the names of the files to be examined.
-m Instructs file to use an alternate magic file.
Restrictions
It often does a poor job of distinguishing C programs, shell scripts, English text, and ASCII text.
It does not recognize many programming languages, including Modula, Pascal, and Lisp.
Files
/usr/lib/file/magic
See Also
magic(5)
file(1)