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advdef(1) [centos man page]

AdvanceCOMP Deflate Compression Utility(1)		      General Commands Manual			AdvanceCOMP Deflate Compression Utility(1)

advdef - AdvanceCOMP Deflate Compression Utility SYNOPSIS
advdef [-z, --recompress] [-0, --shrink-store] [-1, --shrink-fast] [-2, --shrink-normal] [-3, --shrink-extra] [-4, --shrink-insane] [-f, --force] [-q, --quiet] [-h, --help] [-V, --version] FILES... DESCRIPTION
The main purpose of this utility is to recompress the data present in the .png, .mng, .gz, .tgz and .svgz files. The internal structure of the files isn't changed. Only the compressed data is modified. OPTIONS
-z, --recompress FILES... Recompress the specified files. If the -1, -2, -3, -4 options are specified it's used the smallest file choice from the previous compressed data and the new compression. If the -0 option is specified the file is always rewritten without any compression. -0, --shrink-store Disable the compression. The file is only stored and not compressed. The file is always rewritten also if it's bigger. -1, --shrink-fast Set the compression level to "fast". -2, --shrink-normal Set the compression level to "normal". This is the default level of compression. -3, --shrink-extra Set the compression level to "extra". -4, --shrink-insane Set the compression level to "insane". It's VERY SLOW. -f, --force Force the use of the new file also if it's bigger. LIMITATIONS
The advdef program cannot be used to recompress huge files because it needs to allocate memory for both the complete compressed and uncom- pressed data. COPYRIGHT
This file is Copyright (C) 2003, 2004 Andrea Mazzoleni SEE ALSO
advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1) AdvanceCOMP Deflate Compression Utility(1)

Check Out this Related Man Page

Dpkg::Compression(3)						   libdpkg-perl 					      Dpkg::Compression(3)

Dpkg::Compression - simple database of available compression methods DESCRIPTION
This modules provides a few public funcions and a public regex to interact with the set of supported compression methods. EXPORTED VARIABLES
$compression_re_file_ext A regex that matches a file extension of a file compressed with one of the supported compression methods. EXPORTED FUNCTIONS
my @list = compression_get_list() Returns a list of supported compression methods (sorted alphabetically). compression_is_supported($comp) Returns a boolean indicating whether the give compression method is known and supported. compression_get_property($comp, $property) Returns the requested property of the compression method. Returns undef if either the property or the compression method doesn't exist. Valid properties currently include "file_ext" for the file extension, "comp_prog" for the name of the compression program and "decomp_prog" for the name of the decompression program. compression_guess_from_filename($filename) Returns the compression method that is likely used on the indicated filename based on its file extension. my $comp = compression_get_default() Return the default compression method. It's "gzip" unless "compression_set_default" has been used to change it. compression_set_default($comp) Change the default compression method. Errors out if the given compression method is not supported. my $level = compression_get_default_level() Return the default compression level used when compressing data. It's "9" unless "compression_set_default_level" has been used to change it. compression_set_default_level($level) Change the default compression level. Errors out if the level is not valid (see "compression_is_valid_level"). either a number between 1 and 9 or "fast" or "best". compression_is_valid_level($level) Returns a boolean indicating whether $level is a valid compression level (it must be either a number between 1 and 9 or "fast" or "best") AUTHOR
Raphael Hertzog <>. 2012-04-17 Dpkg::Compression(3)
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