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Source code changes of the file "README" between
zutils-1.8.tar.lz and zutils-1.9.tar.lz

About: Zutils is a collection of utilities able to deal with any combination of compressed and non-compressed files transparently. The utilities zcat, zcmp, zdiff, zgrep and ztest supports the compressors bzip2, gzip, lzip and xz.

README  (zutils-1.8.tar.lz):README  (zutils-1.9.tar.lz)
Description Description
Zutils is a collection of utilities able to process any combination of Zutils is a collection of utilities able to process any combination of
compressed and uncompressed files transparently. If any given file, compressed and uncompressed files transparently. If any file given,
including standard input, is compressed, its decompressed content is including standard input, is compressed, its decompressed content is used.
used. Compressed files are decompressed on the fly; no temporary files Compressed files are decompressed on the fly; no temporary files are
are created. created.
These utilities are not wrapper scripts but safer and more efficient C++ These utilities are not wrapper scripts but safer and more efficient C++
programs. In particular the '--recursive' option is very efficient in programs. In particular the option '--recursive' is very efficient in
those utilities supporting it. those utilities supporting it.
The utilities provided are zcat, zcmp, zdiff, zgrep, ztest and zupdate. The utilities provided are zcat, zcmp, zdiff, zgrep, ztest, and zupdate.
The formats supported are bzip2, gzip, lzip and xz. The formats supported are bzip2, gzip, lzip, and xz.
Zutils uses external compressors. The compressor to be used for each Zutils uses external compressors. The compressor to be used for each format
format is configurable at runtime. is configurable at runtime.
zcat, zcmp, zdiff, and zgrep are improved replacements for the shell zcat, zcmp, zdiff, and zgrep are improved replacements for the shell scripts
scripts provided by GNU gzip. ztest is unique to zutils. zupdate is provided by GNU gzip. ztest is unique to zutils. zupdate is similar to
similar to gzip's znew. gzip's znew.
NOTE: Bzip2 and lzip provide well-defined values of exit status, which NOTE: Bzip2 and lzip provide well-defined values of exit status, which makes
makes them safe to use with zutils. Gzip and xz may return ambiguous them safe to use with zutils. Gzip and xz may return ambiguous warning
warning values, making them less reliable back ends for zutils. values, making them less reliable back ends for zutils.
FORMAT NOTE 1: The '--format' option allows the processing of a subset FORMAT NOTE 1: The option '--format' allows the processing of a subset
of formats in recursive mode and when trying compressed file names: of formats in recursive mode and when trying compressed file names:
'zgrep foo -r --format=bz2,lz somedir somefile.tar'. 'zgrep foo -r --format=bz2,lz somedir somefile.tar'.
FORMAT NOTE 2: If the '--force-format' option is given, the files are FORMAT NOTE 2: If the option '--force-format' is given, the files are
passed to the corresponding decompressor without verifying their format, passed to the corresponding decompressor without verifying their format,
allowing for example the processing of compress'd (.Z) files with gzip: allowing for example the processing of compress'd (.Z) files with gzip:
'zcmp --force-format=gz file.Z file.lz'. 'zcmp --force-format=gz file.Z file.lz'.
LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never have
have been compressed. Decompressed is used to refer to data which have been compressed. Decompressed is used to refer to data which have undergone
undergone the process of decompression. the process of decompression.
Copyright (C) 2009-2019 Antonio Diaz Diaz. Copyright (C) 2009-2020 Antonio Diaz Diaz.
This file is free documentation: you have unlimited permission to copy, This file is free documentation: you have unlimited permission to copy,
distribute and modify it. distribute, and modify it.
The file Makefile.in is a data file used by configure to produce the The file Makefile.in is a data file used by configure to produce the
Makefile. It has the same copyright owner and permissions that configure Makefile. It has the same copyright owner and permissions that configure
itself. itself.
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