50 lines
2.1 KiB
Text
50 lines
2.1 KiB
Text
Description
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Zutils is a collection of utilities able to process any combination of
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compressed and uncompressed files transparently. If any file given,
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including standard input, is compressed, its decompressed content is used.
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Compressed files are decompressed on the fly; no temporary files are
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created.
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These utilities are not wrapper scripts but safer and more efficient C++
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programs. In particular the option '--recursive' is very efficient in
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those utilities supporting it.
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The utilities provided are zcat, zcmp, zdiff, zgrep, ztest, and zupdate.
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The formats supported are bzip2, gzip, lzip, xz, and zstd.
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Zutils uses external compressors. The compressor to be used for each format
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is configurable at runtime.
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zcat, zcmp, zdiff, and zgrep are improved replacements for the shell scripts
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provided by GNU gzip. ztest is unique to zutils. zupdate is similar to
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gzip's znew.
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NOTE: Bzip2 and lzip provide well-defined values of exit status, which makes
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them safe to use with zutils. Gzip and xz may return ambiguous warning
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values, making them less reliable back ends for zutils. Zstd currently does
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not even document its exit status in its man page.
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FORMAT NOTE 1: The option '--format' allows the processing of a subset
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of formats in recursive mode and when trying compressed file names. For
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example, use the following command to search for the string 'foo' in
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gzip and lzip files only:
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'zgrep foo -r --format=gz,lz somedir somefile.tar'.
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FORMAT NOTE 2: If the option '--force-format' is given, the files are
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passed to the corresponding decompressor without verifying their format,
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allowing for example the processing of compress'd (.Z) files with gzip:
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'zcmp --force-format=gz file.Z file.lz'.
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LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never have
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been compressed. Decompressed is used to refer to data which have undergone
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the process of decompression.
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Copyright (C) 2009-2022 Antonio Diaz Diaz.
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This file is free documentation: you have unlimited permission to copy,
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distribute, and modify it.
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The file Makefile.in is a data file used by configure to produce the
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Makefile. It has the same copyright owner and permissions that configure
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itself.
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