z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

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magic
Usage Notes
Examples
test will succeed only when a string value exactly matches the bytes from
the file. The string value field can contain at most 127 characters per magic
line.
If the value is a string, it can contain the following sequences:
\character
The backslash-escape sequences as specified in the Base Definitions
volume of IEEE Std 1003.1-2001, Table 5-1, Escape Sequences and
Associated Actions ( ’\\’, ’\a’, ’\b’, ’\f’, ’\n’, ’\r’, ’\t’, ’\v’ ). In addition, the
escape sequence ’\ ’ (the character followed by a
character) will be recognized to represent a character.
\octal
Octal sequences that can be used to represent characters with specific
coded values. An octal sequence will consist of a backslash followed by
the longest sequence of one, two, or three octal-digit characters
(01234567).
By default, any value that is not a string will be interpreted as a signed
decimal number. Any such value, with a leading 0x or 0X, will be interpreted
as an unsigned hexadecimal number; otherwise, with a leading zero, the
value will be interpreted as an unsigned octal number. To maintain
compatibility with other systems, numeric values are not subject to bounds
checking. Use numeric values that match the specified type.
Operators only apply to nonstring types: byte, short and long. The default
operator is = (exact match). The operators are:
= Equal.
! Not equal.
> Greater than.
< Less than.
& All bits in pattern must match.
^ At least one bit in pattern must not match.
x or ? Any value matches (must be the only character in the field). ? is an
extension to traditional implementations of magic.
(d) The rest of the line is the message string to be printed if the particular file
matches the template. Note that the contents of this field is ignored if the
line begins with the & continuation character. The fourth field may contain a
printf ()-type format indicator to output the magic number (see printf for
more details on format indicators). If the field contains a printf ()-type
format indicator, the value read from the file will be the argument to printf.
1. Characters from a code page other than IBM-1047 should not be added to the
/etc/magic file (the default magic file).
2. Characters from a code page other than IBM-1047 can be used in alternate
magic files that are specified by the –m or -M option on the file command.
These characters should only be used in the third field of the magic file
template when the field type is string. They will only match files containing
these characters when the file command is invoked in the non-IBM-1047 locale.
Here are some sample entries:
0 short 0x5AD4 DOS executable
914 z/OS V1R9.0 UNIX System Services Command Reference