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3 Zutils is a collection of utilities able to process any combination of
4 compressed and uncompressed files transparently. If any file given,
5 including standard input, is compressed, its decompressed content is used.
6 Compressed files are decompressed on the fly; no temporary files are
9 These utilities are not wrapper scripts but safer and more efficient C++
10 programs. In particular the option '--recursive' is very efficient in
11 those utilities supporting it.
13 The utilities provided are zcat, zcmp, zdiff, zgrep, ztest, and zupdate.
14 The formats supported are bzip2, gzip, lzip, and xz.
15 Zutils uses external compressors. The compressor to be used for each format
16 is configurable at runtime.
18 zcat, zcmp, zdiff, and zgrep are improved replacements for the shell scripts
19 provided by GNU gzip. ztest is unique to zutils. zupdate is similar to
20 gzip's znew.
22 NOTE: Bzip2 and lzip provide well-defined values of exit status, which makes
23 them safe to use with zutils. Gzip and xz may return ambiguous warning
24 values, making them less reliable back ends for zutils.
26 FORMAT NOTE 1: The option '--format' allows the processing of a subset
27 of formats in recursive mode and when trying compressed file names:
28 'zgrep foo -r --format=bz2,lz somedir somefile.tar'.
30 FORMAT NOTE 2: If the option '--force-format' is given, the files are
31 passed to the corresponding decompressor without verifying their format,
32 allowing for example the processing of compress'd (.Z) files with gzip:
33 'zcmp --force-format=gz file.Z file.lz'.
35 LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never have
36 been compressed. Decompressed is used to refer to data which have undergone
37 the process of decompression.
40 Copyright (C) 2009-2021 Antonio Diaz Diaz.
42 This file is free documentation: you have unlimited permission to copy,
43 distribute, and modify it.
45 The file Makefile.in is a data file used by configure to produce the
46 Makefile. It has the same copyright owner and permissions that configure