05-12-2004
If you mean binary in the unix sense (no carriage control)
use the command "file", and it is not some type of ELF or a.out format file:
file filename for a "binary" file
returns
filename: data
If file finds carriage control (newlines) and printable ascii characters:
filename: ascii data
Otherwise, it uses a magic number to figure out what type of file you are dealing with.
On PC's under DOS or Windows, binary files do not have exactly the same meaning they do for unix, nor does the file system handle them the same way. The EOF marker for text files is control-Z, ASCII 26. Binary files keep the length of the file in the FAT, and treat ascii 26 as an ordinary character. Unix does not do this. There is no EOF marker in the file. Binary and ascii files are handled the same way by the file system. It keeps track of where the file ends.
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deb-old(5) dpkg suite deb-old(5)
NAME
deb-old - old style Debian binary package format
SYNOPSIS
filename.deb
DESCRIPTION
The .deb format is the Debian binary package file format. This manual page describes the old format, used before Debian 0.93. Please see
deb(5) for details of the new format.
FORMAT
The file is two lines of format information as ASCII text, followed by two concatenated gzipped ustar files.
The first line is the format version number padded to 8 digits, and is 0.939000 for all old-format archives.
The second line is a decimal string (without leading zeroes) giving the length of the first gzipped tarfile.
Each of these lines is terminated with a single newline character.
The first tarfile contains the control information, as a series of ordinary files. The file control must be present, as it contains the
core control information.
In some very old archives, the files in the control tarfile may optionally be in a DEBIAN subdirectory. In that case, the DEBIAN
subdirectory will be in the control tarfile too, and the control tarfile will have only files in that directory. Optionally the control
tarfile may contain an entry for '.', that is, the current directory.
The second gzipped tarfile is the filesystem archive, containing pathnames relative to the root directory of the system to be installed on.
The pathnames do not have leading slashes.
SEE ALSO
deb(5), dpkg-deb(1), deb-control(5).
1.19.0.5 2018-04-16 deb-old(5)