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There is a magic number associated with each binary file , does anyone know how to retrieve this information from the file?
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Locating Magic Numbers in File Signatures Magic numbers/File signatures are typically not visible to the user but can be seen by using a hex editor or by using the 'xxd' command as mentioned below. These bytes are essential for a file to be opened.
ANSWER: A magic number is a numeric or string constant that indicates the file type. This number is in the first 512 bytes of the file. By default the localized magic file /usr/lib/locale/locale/LC_MESSAGES/magic is used to identify files that have a magic number.
Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF . Using only the letters ABCDEF it is possible to spell several words.
A magic number is a number embedded at or near the beginning of a file that indicates its file format (i.e. the type of file it is). This number is not visible to us. Every file has a number that represents the name of file types which is hexadecimal format.
file <file_name>
magic numbers are usually stored in (linux):
/usr/share/file/magic
also check this link, someone was trying to use libmagic to get the information in C program, might be useful if you're writing something yourself.
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