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Top Forums Shell Programming and Scripting Print only matched string instead of entire line Post 302621503 by Corona688 on Tuesday 10th of April 2012 01:31:58 PM
Old 04-10-2012
Quote:
Originally Posted by Epsilon
Suppose file abc.txt contains:
It doesn't contain those literal characters. It contains masses of binary characters that are represented as control-a, control-@, and so forth. grep will (rightly) determine that this is a binary file with information not representable on a terminal, and just print yes/no information instead of matching lines.

That is why you need -a to force it into treating it as text.
 

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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)
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