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version 1.17, 2016/04/24 07:02:07

version 1.18, 2017/09/20 10:03:34

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This manual page documents the format of the magic file as

used by the

.Xr file 1

command, version 4.24.

command.

The

.Xr file 1

command identifies the type of a file using,

identifies the type of a file using,

among other tests,

a test for whether the file contains certain

.Dq "magic patterns" .

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.Em x

(which is always true) and a message that is to be used if there are

no other matches.

.It Dv clear

This test is always true and clears the match flag for that level.

It is intended to be used with the default test.

.It Dv name

Define a named magic instance that can be called from another

.Dv use

magic entry, like a subroutine call.

Named instance direct magic offsets are relative to the offset of the

previous matched entry, but indirect offsets are relative to the

beginning of the file as usual.

Named magic entries always match.

.It Dv use

Recursively call the named magic starting from the current offset.

If the name of the referenced instance begins with a

.Dv ^

then the endianness of the magic is switched; if the magic mentioned

.Dv leshort

for example,

it is treated as

.Dv beshort

and vice versa.

This is useful to avoid duplicating the rules for different endianness.

.El

.Pp

Each top-level magic pattern (see below for an explanation of levels)