Description Zutils is a collection of utilities able to deal with any combination of compressed and uncompressed files transparently. If any given file, including standard input, is compressed, its decompressed content is used. Compressed files are decompressed on the fly; no temporary files are created. These utilities are not wrapper scripts but safer and more efficient C++ programs. In particular the "--recursive" option is very efficient in those utilities supporting it. The provided utilities are zcat, zcmp, zdiff, zgrep, ztest and zupdate. The supported formats are bzip2, gzip, lzip and xz. Zutils uses external compressors. The compressor to be used for each format is configurable at runtime. zcat, zcmp, zdiff, and zgrep are improved replacements for the shell scripts provided by GNU gzip. ztest is unique to zutils. zupdate is similar to gzip's znew. NOTE: Bzip2 and lzip provide well-defined values of exit status, which makes them safe to use with zutils. Gzip and xz may return ambiguous warning values, making them less reliable back ends for zutils. FORMAT NOTE 1: The "--format" option allows the processing of a subset of formats in recursive mode and when trying compressed file names: "zgrep foo -r --format=bz2,lz somedir somefile.tar". FORMAT NOTE 2: If the "--force-format" option is given, the files are passed to the corresponding decompressor without verifying their format, allowing for example the processing of compress'd (.Z) files with gzip: "zcmp --force-format=gz file.Z file.lz". LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never have been compressed. Decompressed is used to refer to data which have undergone the process of decompression. Copyright (C) 2009-2017 Antonio Diaz Diaz. This file is free documentation: you have unlimited permission to copy, distribute and modify it. 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 itself.